Slide 1
Its My Pressure WelcomingTo Science PPT
INTRODUCTION OF NATURAL DISASTERS
Anatural disasteris a majoradverse eventresulting fromnatural
processesof the Earth; examples
includefloods,hurricanes,tornadoes,volcanic
eruptions,earthquakes,tsunamis, and other geologic processes. A
natural disaster can cause loss of life or property damage,and
typically leaves some economic damage in its wake, the severity of
which depends on the affected population'sresilience, or ability to
recover and also on the infrastructure available.An adverse event
will not rise to the level of a disaster if it occurs in an area
without vulnerable population. In a vulnerable area, however, such
asNepal during the 2015 earthquake, an earthquake can have
disastrous consequences and leave lasting damage, requiring years
to repair.
Anearthquake(also known as aquake,tremorortemblor) is the
shaking of the surface of the Earth, resulting from the sudden
release of energy in theEarth'scrustthat createsseismic waves.
Earthquakes can be violent enough to toss people around and destroy
whole cities. Theseismicityorseismic activityof an area refers to
the frequency, type and size of earthquakes experienced over a
period of time.
Afloodis an overflow of water that submerges land which is
usually dry.[1]TheEuropean Union(EU)Floods Directivedefines a flood
as a covering bywaterof land not normally covered by water.[2]In
the sense of "flowing water", the word may also be applied to the
inflow of thetide.Flooding may occur as an overflow of water from
water bodies, such as ariver,lake, or ocean, in which the water
overtops or breakslevees, resulting in some of that water escaping
its usual boundaries,[3]or it may occur due to an accumulation of
rainwater on saturated ground in an areal flood.
A volcano is a mountain that opens downward to a pool of molten
rock below the surface of the earth. When pressure builds up,
eruptions occur. Gases and rock shoot up through the opening and
spill over or fill the air with lava fragments. Eruptions can cause
lateral blasts, lava flows, hot ash flows, mudslides, avalanches,
falling ash and floods. Volcano eruptions have been known to knock
down entire forests. An erupting volcano can trigger tsunamis,
flash floods, earthquakes, mudflows and rockfalls.
Hayan Computers @ AlipurYou gave me your time, the Most
thoughtful gift of allThank you.Syed Anzar Hussain
