Soil

1. Is made of

1.1. Organic matter

1.1.1. made of

1.1.1.1. nutrients

1.1.1.1.1. Nitrogen

1.1.1.1.2. Phosphorus

1.1.1.1.3. Potassium

1.1.2. A combination of decomposing plant and animal material

1.2. Weathered rocks

1.2.1. Sand

1.2.2. Silt

1.2.3. Clay

2. Descriptions

2.1. Color

2.1.1. Color of soil can vary from grayish to yellow to deep red brown down to black

2.2. Consistence

2.2.1. Loose

2.2.2. Friable

2.2.3. Firm

2.3. Texture

2.3.1. Grainy

2.3.2. Silky

2.3.3. Sticky

3. Certain plants have to grow in certain soils in order for the plants to grow.

4. Layers

4.1. Topsoil

4.2. Subsoil

4.3. Parent Material

4.3.1. Made up of slightly broken-up bedrock. Organic matter is rarely found in this layer.

4.4. Bedrock

4.4.1. A layer of rock beneath all of the soil layers.

5. Types

5.1. Desert

5.2. Grassland

5.3. Forest

5.4. Tropical Grassland