1) When students describe whether soil is rough, smooth, or grainy, what soil property are they studying? a) size b) weight c) texture d) amount 2) Which process happens first when soil is formed? a) A. Plants grow in the ground b) B. Rocks break into smaller pieces c) C. Animals move into the soil d) D. Sand washes into the ocean 3) What do we call the nutrient-rich material made from dead plants and animals in soil? a) A. Dry sand b) B. Broken rock c) Clay d) Humus 4) What is the name of the process when dead plants and animals slowly break down? a) Weathering b) Decomposition c) Evaporation d) Erosion 5) The organic matter in soil is − a) humus b) bits of rock c) minerals d) all of the above 6) The four main ingredients of soil are − a) wind, water, ice, and humus b) water, air, rocks, humus c) worms, ice, rocks, and air. d) water, air, rocks, and worms. 7) Decomposition is a) a force due to friction. b) rocks moving away c) the breaking down of dead organisms. d) answer not here.

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