1) How long does it take for a 2.5 cm thick layer of soil to form ? a) 100 years b) 500 years c) 1000 years d) 2500 years 2) Which of the following is an example of a biotic material ? a) water b) Soil c) Plants d) Rocks 3) How does regional climate affect the rate of Soil formation ? a) Regions with heavy rainfall and high temperatures experience rapid soil formation. b) Dry and arid regions have faster soil formation due to less erosion. c) Cold regions with low temperatures experience rapid soil formation. d) Regional climate does not affect the rate of soil formation. 4) Black soil is formed mainly from the weathering of which type of parent rock ? a) Granite b) Basalt c) Sandstone d) Limestone

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