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15 Cards in this Set

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