- Clearly distinguish between mechanical and chemical weathering.
Mechanical weathering is a process in which rock is broken down by physical means into smaller and smaller pieces; there is no change in the chemical composition of the rock. Chemical weathering breaks rock down through chemical reactions resulting in a change in the chemical composition of the rock.
- Would the arctic regions of Canada and the U.S. (Alaska) experience more chemical weathering or more physical weathering? Explain.
Arctic regions would experience more physical weathering. This is because these regions have significant seasonal variations in temperature that would result in a great deal of freezing and thawing of water in cracks in rocks. Chemical weathering dominates in areas with higher temperatures and plentiful rainfall.
- Why is soil so important?
Soil is important because it contains nutrients that support plant and animal life and because most of the food that we eat is grown in soil.
- What is the single most significant factor affecting soil formation?
Climate is the single most significant factor affecting soil formation.
- How is soil classified?
Soil is classified on the basis of physical and chemical properties.