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Temperature variations in glacial regions
In glacial regions of the world or during forest fires the rocks are exposed to extreme temperatures. Since the conduction of heat is very slow, the temperatures at the surface and the interior of the rock are quite different thereby a kind of lateral stress is generated which may cause the peeling off of the external layers of the rock. This phenomenon is called as exfoliation and is accelerated by freezing of water trap ped inside the rock crevices and unloading i.e., the removal of overlying rocks or sediments causing the release of pressure.
Moisture from breathing Moisture coming from breathing might be shown by blowing on a cool mirror or into a cool glass or bottle.
How old is the earth Ans) The earth has only very freshly been accurately dated. Until astonishingly recently, the earth was thought to be anywhere among a few hundred thousand
what is acid
Define Ishihara's Charts - Colour Blindness Colour blindness is often assessed using Ishihara's charts. If ever you visited an eye specialist, you too must have seen this chart
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fertilization of an earthworm
Fire Blankets : We have already discussed the use of fire blankets, but it is worth noting that fire blankets are now made of glass fibre instead of asbestos, and that they are u
Question 1 What are the sources of water pollution? List some measures that can help overcome the problem of water pollution Question 2 Environmental accidents can b
where can glacier erosion occur?
Explain Yawing Reflex Actions - Respiratory Pocess Yawning: It is a deep inspiration drawn through open mouth. Low oxygen tension in the blood may be the cause of yawning.
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