soil

1. description

1.1. sandy - Desert soil

1.2. little wet- forest soil

1.3. grassy- glassland soil

1.4. wet- tropical soil

2. types

2.1. Desert soil

2.2. Forest soil

2.3. Grassland soil

2.4. Tropical soil

3. layers

3.1. sand

3.2. grass

3.3. wet

3.4. little wet

4. is made of

4.1. weather rock

4.1.1. sand

4.1.2. silt

4.1.3. clay

4.2. organic matter