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soil 3.7


components of soil rock, clay, sand, silt, and humus
3 layers of soil topsoil, subsoil, and bedrock
What is topsoil? the upper part of soil. good for growing plants
How is soil formed? by a process called weathering
What is weathering? the breaking down of rock into smaller pieces by water,wind, and plants
What is subsoil and bed rock? layers of soil under the topsoil. not good for growing plants
top soil is made by______. the breaking down of subsoil and bedrock
Humus is _. decayed matter in the topsoil. It adds nutrients to the soil.
Clay contains tiny particles of soil that holds water well and has some nutrients
Sand is made up of small grains of worn-down rock, has few nutrients, and does not hold water well or
Silt is made up of very small broken pieces of rock. It is small than sand and larger than clay.
Conserve means to ___. use wisely
Why should we conserve soil? It takes thousands of years to form.
How do we protect soil? We plant plants, so the roots will hold the soil in place.
Why do we need soil? It gives us nutrients that plants need to grow.
Created by: cparks3