Chapter Review:
- The rotten death material presence in soil is known as humus.
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The mixture of rock particles and humus is called the soil.
- The breaking down of rocks by the action of wind, water, and climate. This process is called weathering.
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A vertical section through different layers of the soil is called the soil profile.
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Each layer differ in feel (texture), colour, depth and chemical composition. These layers are referred to as horizons.
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The upper layer is generally soft, porous and can retain more water; it is called the topsoil or the A-horizon.
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Absorbing water by the soil is known as percolation.
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The removal of land surface by water wind or ice is known as soil erosion.
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The soil is formed by the breaking down of rocks by the action of wind, water and climate.
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The best topsoil for growing plants is loam. Loamy soil is a mixture of sand, clay and another type of soil particle known as silt.
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Clayey soil is used to make pots, toys and statues.
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Soil is affected by wind, rainfall, temperature, light and humidity.
