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The Changing Landscape. Different types of soil Soil is made of four parts: 1) Sand 2) Silt 3)Clay 4)Humus. The Changing Landscape. Sand, Silt and Clay are inorganic. Sand is the largest particle in the soil. When you rub it, it feels rough. This is because it has sharp edges. .

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Presentation Transcript
the changing landscape1

Different types of soil

Soil is made of four parts:

1) Sand

2) Silt

3)Clay

4)Humus

The Changing Landscape
the changing landscape2

Sand, Silt and Clay are inorganic.

Sand is the largest particle in the soil. When you rub it, it feels rough. This is because it has sharp edges.

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Silt is a soil particle whose size is between sand and clay.

Silt feels smooth and powdery. When wet it feels smooth but not sticky.

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Clay is the smallest of the particles. Clay is smooth when dry and stick when wet.

Soils high in clay content are called heavy soils.

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Clay can also hold lots of nutrients, but doesn’t let air and water through it well.

Nutrients are food for living things.

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Humus is organic matter. Organic means naturaland made from living things.

It is made of decayed or dead plants and animals. Humus contains the most nutrients.

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Clay soil is heavy. It has few spaces between the pieces so drainage is not good. It holds nutrients well but doesn’t allow water and air to pass through.

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Loam soil has a lot of organic matter. It has a good mixture of sand, silt, clay and humus. It has good drainage and plenty of nutrients.

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Plants need air, water, and nutrients from soil. Loam has all of these things so it is the best for growing plants.

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Some plants use humus for nutrients. Small animals eat the plants and bigger animals eat the small animals.

Humus is an important part of the food chain.

The Changing Landscape