Soil

1. What is soil made of?

1.1. Organic Material

1.2. Made of: decomposed animals, leaves, sticks

1.3. Definition: matter composed of organic compounds that has come from the remains of organisms

1.4. Weathered rocks

1.5. Made of: sand, silt, clay

2. Layers

3. Types of Soil

3.1. Forest soil

3.1.1. Definition: Moist, loose consistency, color ranges from grayish brown to reddish brown, good for farming

3.2. Desert Soil

3.2.1. Definition: not a lot of rainfall, firm consistency, gritty texture, easily moved by wind and water, dry and sandy

3.3. Grassland Soil

3.3.1. Definition: wet and dry seasons, rich in nutrients, lots of plant matter, good for farming, color is usually reddish brown, loose consistency, silky texture

3.4. Tropical Grassland Soil

3.4.1. warm all year long, wet and dry seasons, weathered and greyish brown, sticky texture

4. Definition:

4.1. the upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles.

5. Nutrients

5.1. Soil needs three types of nutrients: nitrogen, phosphorus, and potassium.

5.2. N=Nitrogen.

5.3. Defintion: the chemical element of atomic number 7, a colorless, odorless unreactive gas that forms about 78 percent of the earth's atmosphere.

5.4. P=Phosphorus

5.5. Definition: the chemical element of atomic number 15, a poisonous, combustible nonmetal that exists in two common allotropic forms, white phosphorus, a yellowish waxy solid that ignites spontaneously in air and glows in the dark, and red phosphorus, a less reactive form used in making matches.

5.6. K=Potassium

5.7. Definition: the chemical element of atomic number 19, a soft silvery-white reactive metal of the alkali metal group.