Thai
Sikh International School
Year
9,Geo Notes[ Topic 12,Weathering]
1.
How
is weathering different from erosion?
Weathering
is the breakdown of rock by mechanical, physical and biological forces that do
not remove it. No transport of material is involved apart from the weathered
material slipping or falling down wards under the influence of gravity.
Erosion
is the breakdown of rock by moving water, ice and to a small extent, wind which
then transport the eroded material away.
2.
What
is the difference between Mechanical and chemical weathering?
Mechanical
(physical) weathering involves disintegration of rocks into smaller pieces with
no chemical change in their composition. It takes place in all regions where
there are changes in temperature and is seen in hot tropical desert areas where
there is a large daily temperature range.
Chemical
weathering involves the decomposition of rocks by changing their chemical
composition. It takes place in all regions where there is rain but is seen
mostly in humid tropical areas with high temperatures.
3.
In
what ways do plants and animals contribute to mechanical and chemical
weathering?
Plants
contribute to mechanical weathering by using their roots to force apart rocks
along bedding planes, joints or cracks. Burrowing animals contribute to the
breaking up and loosening of rocks. Both plants and animals contribute to
chemical weathering by releasing acids and other chemicals in their life cycle,
including during their own decomposition.
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