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This is the Target Menu for one target from a group of targets from the Science Framework for Planning
 Group 15 - The Earth & its Resources
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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