soil

1. layers

1.1. sand

1.2. grass

1.3. wet

1.4. little wet

2. description

2.1. sandy - Desert soil

2.2. little wet- forest soil

2.3. grassy- glassland soil

2.4. wet- tropical soil

3. is made of

3.1. weather rock

3.1.1. sand

3.1.2. silt

3.1.3. clay

3.2. organic matter

4. types

4.1. Desert soil

4.2. Forest soil

4.3. Grassland soil

4.4. Tropical soil