Soil

1. is made of

1.1. organic matter

1.2. weathered rocks

1.2.1. sand

1.2.2. silt

1.2.3. clay

2. layers

2.1. Topsoil

2.2. bedrock

3. Types

3.1. Grassland soil

3.2. Desert soil

3.3. tropical grassland soil

3.4. forest

4. Description

4.1. color

4.2. consistence

4.3. texture