Question | Answer |
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. |