SCIENCE
ECOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -The accumulation of material through the action of water, wind and gravity also contributes to soil formation. These processes can be very slow, taking many tens of thousands of years.
Detailed explanation-2: -Generating three centimetres of topsoil takes 1, 000 years, and if current rates of degradation continue all of the world’s topsoil could be gone within 60 years.
Detailed explanation-3: -How many soil types are there? There are six most common types of soil for agriculture: sand, clay, silt, chalk, peat, and loam.
Detailed explanation-4: -A: We say that it takes 500 to thousands of years to create an inch of topsoil. The reason is that soil is often derived from rock. The rock has to be broken into small pieces first. This happens by physical weathering: things like freezing and thawing in colder climates, and chemical weathering in warmer climates.