Earth and Space Materials from Earth
|Target Menu for ES-D2.4
|Describe how soils are formed
|Soil is formed by the weathering of rock and contains both living and non-living materials.
The main soil constituents are clay, sand and humus.
Humus comprises the broken down remains of living organisms mostly of plant origin.
Soils contain varying amounts of water and air.
Good soil is important for the healthy growth of plants and therefore for food.
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