Soil

1. nutrients the fertilize the plants

1.1. rocks

1.2. twigs

1.3. soil

2. layers

2.1. topsoil

2.2. subsoil

2.3. bedrock

3. types

3.1. clay

3.2. loam

3.3. gravel

3.4. sand

4. Soil is important because it helps plants grow with it's nutrients.

4.1. why is soil important?

5. there are four different U.S. soils

5.1. grassland soils

5.2. desert soils

5.3. tropical grassland soils

5.4. forest soils

6. weathered rocks

6.1. Clay

6.2. Silt

6.3. Sand

7. descriptions

7.1. sandy

7.2. rocky

7.3. bummpy

8. Is made of...