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15 Cards in this Set
- Front
- Back
The process that breaks up rocks
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Weathering
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What are lichens?
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Tiny, plantlike living things that grow on the outsides of rocks
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What three weather factors break rocks apart?
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Temperature changes, wind and water
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Topsoil contains ___________ and _________________
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humus, bits of rock
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Where does most rock weathering happen?
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Subsoil
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What dissolves nutrients in soil?
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Water
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______________ is a product that makes soil richer
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Fertilizer
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Soil rich in nutrients and provides the right conditions for plants to grow is___________
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Fertile
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___________ and ___________ are properties of soil
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Color; texture
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Which soil type best absorbs water?
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Soil with a lot of humus (potting soil)
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How many soil types have scientists identified?
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over 70,000
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What is contained in subsoil?
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Small rocks
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What are the three main layers of soil?
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Topsoil, subsoil and bedrock
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_____________ is the process that breaks up rock
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Weathering
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What are three farming methods to save soil?
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contour plowing, strip cropping and terracing
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