Seasons

Seasons

winterSummer Spring Autumn monsoon

winter

Winter (/ˈwɪntər/) is the coldest season of the year in polar and temperate climates, between autumn and spring. Winter is caused by the axis of the Earth in that hemisphere being oriented away from the Sun. Different cultures define different dates as the start of winter, and some use a definition based on weather. When it is winter in the Northern Hemisphere it is summer in the Southern Hemisphere, and vice versa. In many regions, winter is associated with snow and freezing temperatures. The moment of winter solstice is when the sun's elevation with respect to the North or South Pole is at its most negative value (that is, the sun is at its farthest below the horizon as measured from the pole). The earliest sunset and latest sunrise dates outside the polar regions differ from the date of the winter solstice, however, and these depend on latitude, due to the variation in the solar day throughout the year caused by the Earth's elliptical orbit (see earliest and latest sunrise and sunset).

Summers

Summer is the hottest of the four temperate seasons, falling between spring and autumn. At the summer solstice, the days are longest and the nights are shortest, with day-length decreasing as the season progresses after the solstice. The date of the beginning of summer varies according to climate, tradition and culture, but when it is summer in theNorthern Hemisphere it is winter in the Southern Hemisphere, and vice versa.

Spring

Spring is one of the four conventional temperate seasons, following winter and preceding summer. There are various technical definitions of spring, but local usage of the term varies according to local climate, cultures and customs. When it is spring in the Northern Hemisphere, it will be autumn in the Southern Hemisphere. At the spring equinox, days are approximately 12 hours long with day length increasing as the season progresses. Spring and "springtime" refer to the season, and also to ideas of rebirth, rejuvenation, renewal, resurrection and regrowth. Subtropical and tropical areas have climates better described in terms of other seasons, e.g. dry or wet, monsoonal or cyclonic. Often the cultures have locally defined names for seasons which have little equivalence to the terms originating in Europe.

autumn Autumn is the season after summer and before winter. In

the United States this season is also called fall. In the Northern Hemisphere, it begins with the autumnal equinox in September and ends with the winter solstice in December. In the Southern Hemisphere, it runs from the autumnal equinox in March to the winter solstice in June.

In many places, autumn is a time for harvesting most crops. Deciduous trees (trees that lose their leaves every year) lose their leaves, usually after turning yellow, red, or brown. In many countries, autumn is the time a new school year starts. In the UK, the period of school between the start of September and the end of December is known as the 'Autumn Term'.

Monsoon Monsoon is traditionally defined as a seasonal reversing wind

accompanied by corresponding changes in precipitation,[1] but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with the asymmetric heating of land and sea. Usually, the term monsoon is used to refer to the rainy phase of a seasonally changing pattern, although technically there is also a dry phase.

The major monsoon systems of the world consist of the West African and Asia-Australian monsoons. The inclusion of the North and South American monsoons with incomplete wind reversal has been debated.

The term was first used in English in British India (now India, Bangladesh and Pakistan) and neighbouring countries to refer to the big seasonal winds blowing from the Bay of Bengal and Arabian Sea in the southwest bringing heavy rainfall to the area.The south-west monsoon winds are called 'Nairutya Maarut' in India.

Thank you -:

by- prachi khurana 7-E

2015