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Geography Project
A volcano is an opening, or rupture, in a planet's surface or crust, which allows hotmagma, volcanic
ash and gases to escape from below the surface.
Volcanoes are generally found where tectonic plates are diverging or converging. Amid-oceanic ridge, for
example the Mid-Atlantic Ridge, has examples of volcanoes caused by divergent tectonic plates pulling
apart; the Pacific Ring of Fire has examples of volcanoes caused by convergent tectonic plates coming
together. By contrast, volcanoes are usually not created where two tectonic plates slide past one another.
Volcanoes can also form where there is stretching and thinning of theEarth's crust in the interiors of
plates, e.g., in the East African Rift, the Wells Gray-Clearwater volcanic field and the Rio Grande Rift in
North America. This type of volcanism falls under the umbrella of "Plate hypothesis" volcanism.[1] Volcanism away from plate boundaries has also been explained as mantle plumes. These so-called
"hotspots", for example Hawaii, are postulated to arise from upwelling diapirswith magma from the core-
mantle boundary, 3,000 km deep in the Earth.
Erupting volcanoes can pose many hazards, not only in the immediate vicinity of the eruption. Volcanic
ash can be a threat to aircraft, in particular those with jet engines where ash particles can be melted bythe high operating temperature. Large eruptions can affect temperature as ash and droplets of sulfuric
acid obscure the sun and cool the Earth's lower atmosphere or troposphere; however, they also absorb
heat radiated up from the Earth, thereby warming thestratosphere. Historically, so-called volcanic
winters have caused catastrophic famines.
Stratovolcanoes (composite volcanoes)
Cross-section through a stratovolcano (vertical scale is
exaggerated):
1. Large magma chamber 9. Layers of lava emitted by the
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2. Bedrock
3. Conduit (pipe)
4. Base
5. Sill
6. Dike
7. Layers of ash emitted by the
volcano
8. Flank
volcano
10. Throat
11. Parasitic cone
12. Lava flow
13. Vent
14. Crater
15. Ash cloud
Main article: Stratovolcano
Stratovolcanoes or composite volcanoes are tall conical mountains composed of lava flows and other
ejecta in alternate layers, the strata that give rise to the name. Stratovolcanoes are also known as
composite volcanoes, created from several structures during different kinds of eruptions. Strato/composite
volcanoes are made of cinders, ash and lava. Cinders and ash pile on top of each other, lava flows on top
of the ash, where it cools and hardens, and then the process begins again. Classic examples include Mt.
Fuji in Japan, Mayon Volcano in the Philippines, and Mount Vesuvius and Stromboli in Italy.
In recorded history, explosive eruptions by stratovolcanoes have posed the greatest hazard to
civilizations, as ash is produced by an explosive eruption. No supervolcano erupted in recorded history.
Shield volcanoes have not an enormous pressure build up from the lava flow. Fissure vents
and monogenetic volcanic fields (volcanic cones) have not powerful explosive eruptions, as they are
many times under extension. Stratovolcanoes (30–35°) are steeper than shield volcanoes (generally 5–
10°), their loose tephra are material for dangerous lahars.[3]
Supervolcanoes
Main article: Supervolcano
See also: List of largest volcanic eruptions
A supervolcano is a large volcano that usually has a large caldera and can potentially producedevastation on an enormous, sometimes continental, scale. Such eruptions would be able to cause
severe cooling of global temperatures for many years afterwards because of the huge volumes
of sulfur and ash erupted. They are the most dangerous type of volcano. Examples include Yellowstone
Caldera inYellowstone National Park and Valles Caldera in New Mexico (both western United
States), Lake Taupo in New Zealand, Lake Toba in Sumatra, Indonesia andNgorogoro
Crater in Tanzania, Krakatoa near Java and Sumatra, Indonesia. Supervolcanoes are hard to identify
centuries later, given the enormous areas they cover. Large igneous provinces are also considered
supervolcanoes because of the vast amount of basalt lava erupted, but are non-explosive.
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Effects of volcanoes
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Schematic of volcano injection of aerosols and gases.
Solar radiation graph 1958-2008, showing how the radiation is reduced after major volcanic eruptions.
Sulfur dioxide concentration over theSierra Negra Volcano, Galapagos Islandsduring an eruption in October 2005
There are many different types of volcanic eruptions and associated activity: phreatic eruptions (steam-
generated eruptions), explosive eruption of high-silicalava (e.g., rhyolite), effusive eruption of low-silica
lava (e.g., basalt), pyroclastic flows, lahars (debris flow) andcarbon dioxide emission. All of these
activities can pose a hazard to humans. Earthquakes, hot springs,fumaroles, mud pots and geysers often
accompany volcanic activity.
The concentrations of different volcanic gases can vary considerably from one volcano to the next. Water
vapor is typically the most abundant volcanic gas, followed bycarbon dioxide and sulfur dioxide. Other
principal volcanic gases include hydrogen sulfide, hydrogen chloride, and hydrogen fluoride. A largenumber of minor and trace gases are also found in volcanic emissions, for example hydrogen, carbon
monoxide, halocarbons, organic compounds, and volatile metal chlorides.
Large, explosive volcanic eruptions inject water vapor (H2O), carbon dioxide (CO2), sulfur dioxide (SO2),
hydrogen chloride (HCl), hydrogen fluoride (HF) and ash (pulverized rock and pumice) into
the stratosphere to heights of 16–32 kilometres (10–20 mi) above the Earth's surface. The most
significant impacts from these injections come from the conversion of sulfur dioxide to sulfuric
acid(H2SO4), which condenses rapidly in the stratosphere to form fine sulfate aerosols. The aerosols
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increase the Earth's albedo—its reflection of radiation from the Sun back into space – and thus cool the
Earth's lower atmosphere or troposphere; however, they also absorb heat radiated up from the Earth,
thereby warming the stratosphere. Several eruptions during the past century have caused a decline in the
average temperature at the Earth's surface of up to half a degree (Fahrenheit scale) for periods of one to
three years — sulfur dioxide from the eruption of Huaynaputina probably caused the Russian famine of
1601–1603.[13]
One proposed volcanic winter happened c. 70,000 years ago following the supereruption of Lake Toba on
Sumatra island in Indonesia.[14] According to the Toba catastrophe theory to which some anthropologists
and archeologists subscribe, it had global consequences,[15] killing most humans then alive and creating
a population bottleneck that affected the genetic inheritance of all humans today.[16] The 1815 eruption
of Mount Tambora created global climate anomalies that became known as the "Year Without a Summer "
because of the effect on North American and European weather .[17] Agricultural crops failed and livestock
died in much of the Northern Hemisphere, resulting in one of the worst famines of the 19th century. [18] The
freezing winter of 1740–41, which led to widespread famine in northern Europe, may also owe its origins
to a volcanic eruption.[19]
It has been suggested that volcanic activity caused or contributed to the End-Ordovician, Permian-
Triassic, Late Devonian mass extinctions, and possibly others. The massive eruptive event which formed
the Siberian Traps, one of the largest known volcanic events of the last 500 million years of Earth's
geological history, continued for a million years and is considered to be the likely cause of the "Great
Dying" about 250 million years ago,[20] which is estimated to have killed 90% of species existing at the
time.[21]
The sulfate aerosols also promote complex chemical reactions on their surfaces that alter chlorine
and nitrogen chemical species in the stratosphere. This effect, together with increased
stratospheric chlorine levels from chlorofluorocarbon pollution, generates chlorine monoxide (ClO), which
destroys ozone (O3). As the aerosols grow and coagulate, they settle down into the upper troposphere
where they serve as nuclei for cirrus clouds and further modify the Earth's radiation balance. Most of thehydrogen chloride (HCl) and hydrogen fluoride (HF) are dissolved in water droplets in the eruption cloud
and quickly fall to the ground as acid rain. The injected ash also falls rapidly from the stratosphere; most
of it is removed within several days to a few weeks. Finally, explosive volcanic eruptions release the
greenhouse gas carbon dioxide and thus provide a deep source of carbon for biogeochemical cycles.
Gas emissions from volcanoes are a natural contributor to acid rain. Volcanic activity releases about 130
to 230 teragrams (145 million to 255 million short tons) of carbon dioxide each year.[22] Volcanic eruptions
may inject aerosols into the Earth's atmosphere. Large injections may cause visual effects such as
unusually colorful sunsets and affect global climate mainly by cooling it. Volcanic eruptions also provide
the benefit of adding nutrients to soil through the weathering process of volcanic rocks. These fertile soils
assist the growth of plants and various crops. Volcanic eruptions can also create new islands, as the
magma cools and solidifies upon contact with the water.
Ash thrown into the air by eruptions can present a hazard to aircraft, especially jet aircraft where the
particles can be melted by the high operating temperature. Dangerous encounters in 1982 after the
eruption of Galunggung in Indonesia, and 1989 after the eruption of Mount Redoubt in Alaska raised
awareness of this phenomenon. Nine Volcanic Ash Advisory Centers were established by
the International Civil Aviation Organization to monitor ash clouds and advise pilots accordingly. The 2010
eruptions of Eyjafjallajökull caused major disruptions to air travel in Europe.
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Science Activity
Hibiscus
Hibiscus ( /
hɨˈbɪs k ə s/[2] or
/
h aɪˈbɪs k ə s /)[3] is a genus of flowering plants in
the mallow family,Malvaceae. It is quite large, containing several hundred species that are native towarm-temperate,subtropical and tropical regions throughout the world. Member species are often noted
for their showy flowers and are commonly known as hibiscus, sorrel, and flor de Jamaica, or less
widely known as rosemallow. The genus includes both annual and perennial herbaceous plants, as well
as woody shrubs and small trees. The generic name is derived from the Greek word ἱβίσκος (hibískos),
which was the name Pedanius Dioscorides (ca. 40-90) gave to Althaea officinalis.[4]
Uses
ried hibiscus is edible, and is often a delicacy in Mexico. It can also be candied and used as a garnish.[7]
The roselle (Hibiscus sabdariffa) is used as a vegetable
Certain species of hibiscus are also beginning to be used more widely as a natural source of foodcoloring (E163),[citation needed
] and replacement of Red #3 / E127.[citation needed ]
Hibiscus species are used as food plants by the larvae of some Lepidoptera species including Chionodes
hibiscella, Hypercompe hambletoni , the Nutmeg moth, and the Turnip Moth.
The tea is popular as a natural diuretic; it contains vitamin C and minerals, and is used traditionally as a
mild medicine.
Dieters or people with kidney problems often take it without adding sugar for its beneficial properties and
as a natural diuretic.
A 2008 USDA study shows consuming hibiscus tea lowers blood pressure in a group of
prehypertensive and mildly hypertensive adults. Three cups of tea daily resulted in an average drop of 8.1points in their systolic blood pressure, compared to a 1.3 point drop in the volunteers who drank the
placebo beverage. Study participants with higher blood pressure readings (129 or above) had a greater
response to hibiscus tea: their systolic blood pressure went down by 13.2 points. These data support the
idea that drinking hibiscus tea in an amount readily incorporated into the diet may play a role in controlling
blood pressure, although more research is required.[9]
Hibiscus rosa-sinensis has a number of medical uses in Chinese herbology.[8]
In the Indian traditional system of medicine, Ayurveda, hibiscus, especially white hibiscus and red
hibiscus (Hibiscus rosa-sinensis), is considered to have medicinal properties. The roots are used to make
various concoctions believed to cure ailments such as cough, hair loss or hair greying. As a hair
treatment, the flowers are boiled in oil along with other spices to make a medicated hair oil. The leaves
and flowers are ground into a fine paste with a little water, and the resulting lathery paste is used as a
shampoo plus conditioner.
Roses
A rose is a woody perennial
of the genus
Rosa, within the family Rosaceae. There are over 100 species.
They form a group of erect shrubs, and climbing or trailing plants, with stems that are often armed with
sharp prickles
. Flowers are large and showy, in colours ranging from white through yellows and reds.
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Most species are native to Asia, with smaller numbers native to Europe, North America, and northwest
Africa. Species, cultivars and hybrids
are all widely grown for their beauty and fragrance. Rose plants
range in size from compact, miniature roses, to climbers that can reach 7 meters in height. Different
species hybridize easily, and this has been used in the development of the wide range of garden roses
.[1]
Uses
Rose perfumes are made from attar of roses or rose oil, which is a mixture of volatile essential
oilsobtained by steam distilling the crushed petals of roses. An associated product is rose water which is
used for cooking, cosmetics, medicine and in religious practices. The production technique originated
in Persia then spread through Arabia and India, and more recently into eastern Europe. In Bulgaria, Iran
and Germany, damask roses (Rosa damascena 'Trigintipetala') are used. In other parts of the world Rosa
centifoliais commonly used. The oil is transparent pale yellow or yellow-grey in colour. 'Rose Absolute' is
solvent-extracted with hexane and produces a darker oil, dark yellow to orange in colour. The weight of oil
extracted is about one three-thousandth to one six-thousandth of the weight of the flowers; for example, a
Geraniol (C10H18O)
The main constituents of attar of roses are the fragrant alcohols geraniol and l-citronellol; and rose
camphor, an odourless paraffin. β-Damascenone is also a significant contributor to the scent.
Rose water , made as a byproduct of rose oil production, is widely used in Asian and Middle Eastern
cuisine. In France there is much use of rose syrup, most commonly made from an extract of rose petals.
In the United States, this French rose syrup is used to make rose scones andmarshmallows.
Rose perfumes are made from attar of roses or rose oil, which is a mixture of volatile essential
oilsobtained by steam distilling the crushed petals of roses. An associated product is rose water which is
used for cooking, cosmetics, medicine and in religious practices. The production technique originated
in Persia then spread through Arabia and India, and more recently into eastern Europe. In Bulgaria, Iran
and Germany, damask roses (Rosa damascena 'Trigintipetala') are used. In other parts of the world Rosa
centifoliais commonly used. The oil is transparent pale yellow or yellow-grey in colour. 'Rose Absolute' is
solvent-extracted with hexane and produces a darker oil, dark yellow to orange in colour. The weight of oil
extracted is about one three-thousandth to one six-thousandth of the weight of the flowers; for example,
about two thousand flowers are required to produce one gram of oil.
Geraniol (C10H18O)
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The main constituents of attar of roses are the fragrant alcohols geraniol and l-citronellol; and rose
camphor, an odourless paraffin. β-Damascenone is also a significant contributor to the scent.
Rose water , made as a byproduct of rose oil production, is widely used in Asian and Middle Eastern
cuisine. In France there is much use of rose syrup, most commonly made from an extract of rose petals.
In the United States, this French rose syrup is used to make rose scones andmarshmallows.
Roses are a favored subject in art and therefore used in various artistic disciplines. They appear in
portraits, illustrations, on stamps, as ornaments or as architectural elements. The Luxembourg
born Belgian artist and botanist Pierre-Joseph Redoutéis known for his detailed watercolours of flowers,
particularly roses.
Renoir's painting of cabbage roses, Roses in a vase
Henri Fantin-Latour was also a prolific painter of still life, particularly flowers including roses. The Rose
'Fantin-Latour' was named after the artist.
Other impressionists including Claude Monet, Paul Cézanne and Pierre-Auguste Renoir have paintings of
roses among their works.
Science Journals
1.
Batteries come in many sizes, from miniature cells used to power hearing aids
and wristwatches
to battery banks the size of rooms that provide standby power for telephone exchanges
and
computer data centers.
2. Various cells and batteries (top-left to bottom-right): twoAA, one D, one handheld ham radio battery, two 9-
volt (PP3), two AAA, one C, one camcorder battery, one cordless phone battery.
Dry cell
Science Project
2012-the international year of forests
A cooperative is an autonomous voluntary association of people who unite to meet commoneconomic, social and cultural needs and aspirations, through a jointly owned and democraticallycontrolled enterprise. In general, they contribute to socio-economic development.
As self-help organizations that meet the needs of their members, cooperatives assist in generatingemployment and incomes throughout local communities. Cooperatives provide opportunities for socialinclusion. In the informal economy, workers have formed shared service cooperatives and associations to
assist in their self-employment. In rural areas, savings and credit cooperatives provide access to bankingservices that are lacking in many communities and finance the formation of small and micro businesses,promotes inclusive finance.
The cooperative sector worldwide has about 800 million members in over 100 countries and isestimated to account for more than 100 million jobs around the world. The strength and reach of cooperatives are illustrated in the following examples:
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• under the umbrella of the World Council of Credit Unions, 49,000 credit unions serve177 million members in 96 countries, and 4,200 banks under the European Association of Cooperative Banks serve 149 million clients;
• agricultural cooperatives account for 80 to 99 per cent of milk production in Norway,New Zealand and the United States; 71 per cent of fishery production in the Republic of Korea; and 40 per cent of agriculture in Brazil;
• electric cooperatives play a key role in rural areas. In Bangladesh, rural electriccooperatives serve 28 million people. In the United States, 900 rural electric cooperativesserve 37 million people and own almost half of the electric distribution lines in thecountry.
International Years are declared by the United Nations to draw attention to major issues andencourage action. To commemorate the Year, regional conferences will raise awareness of cooperativesand seek ways to leverage their contribution to socio-economic development and foster regulatoryframeworks. A research agenda will be proposed and Member States are to form national committeesthat will serve as focal points for the Year’s activities.
For more information, contact the Department of Economic and Social Affairs focal point oncooperatives, Felice Llamas, [email protected], +1 212 963 2924.
NEW YORK, 21 December (Department of Economic and Social Affairs) -- The United NationsGeneral Assembly has declared 2012 as the International Year of Cooperatives, highlighting the contributionof cooperatives to socio-economic development. In adopting resolution 64/136 on 18 December, theAssembly noted that cooperatives impact poverty reduction, employment generation and social integration.
The United Nations General Assembly passed a resolution declaring 2012 the UN International Year
of Co-operatives on December 18, 2009.
The UN resolution entitled 'Co-operatives in Social Development' recognises the diversity of the co-
operative movement around the world and urges governments to take measures aimed at creating a
supportive environment for the development of co-operatives. Click hereto go to the UN IYC website
to find out more about the UN Resolution and about other UN IYC activities.
The International Year of Co-operatives, or IYC, celebrates a different way of doing business, one
focused on human need not human greed, where the members, who own and govern the business,
collectively enjoy the benefits instead of all profits going just to shareholders.
Having an International Year of Co-operatives provides an opportunity to captivate the attention of
national governments, the business community and, most importantly, the general public on the
advantages provided by the co-operative model.
As the global voice of co-operatives, the International Co-operative Alliance is seeking to leverage
the International Year to raise the public awareness of co-operatives worldwide.
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The International Year of Cooperatives is a unique opportunity to celebrate cooperatives. Activities can
include conferences, seminars, workshops, publications, media events, preparation of films, video series,
radio programmes and others. It can also focus on initiating a change in policies requiring short and long-
term lobbying campaigns, undertaking research, collecting statistics, and working with authorities at all
levels. IYC also provide s opportunities to develop new relationships and partnerships with institutions,
development partners, citizen groups, and other business enterprises. It can be the year where
cooperative foundations or support programmes and funds are launched. International Year of
Cooperatives should also reach out to the public - and so commemorative stamps, coins, and events able
to introduce various groups of people to cooperatives through sporting events, concerts, fairs, etc are also
appropriate.
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Cooperative Coffees is a green coffee importing cooperative, comprising 24 community-based coffee
roasters in the USA and Canada, who are committed to building and supporting fair and sustainable trade
relationships for the benefit of farmers and their exporting cooperatives, families, and communities.
We strive to promote transparent Fair Trade and sustainable development alternatives in both the North
and the South, while continuing to sell the highest quality coffee on the market.
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