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Part X : The Environment

Environmental Factors Appropriate for Life :
Associated Practical Work

Environmental Factors Appropriate for Life : Question

Environmental Factors Appropriate for Life
Soil
Life in the Soil
Environment and Distribution
Water
The Water Cycle
The Globe and the Water Cycle
The Seasons
The Seasons and the Sun
How Seasons Influence the Biosphere
Human Influences on the Environment

Topic Chapters Index

 

Soil profile, Aust, UK © Shirley Burchill

Soil profile, Aust, UK © Shirley Burchill

 

Over to You!

Think of all the leaves that fall from the trees in a deciduous forest and think of all the years that this happens.
Why is it that after hundreds, even thousands, of years, the leaves do not pile up higher than the treetops themselves?
Where do all the leaves go?

WHAT IS SOIL MADE OF?

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Soil is made up of a mixture of organic material and minerals. The organic matter comes from dead plants and many of the minerals come from the rocks underground. These rocks, which are part of the lithosphere, are referred to as bedrock. Because the plants grow on top of the soil and the rocks are found underground, soil is made up of layers.

 

Soil profile  © Paul Billiet

 

Different types of soil

The type of soil that forms in a region will depend upon the climate, the bedrock underground, and the plants growing there. In deciduous forests the soil may be deep, rich, and dark brown in colour. In sandy areas the soil will be dry with a dusty grey colour. In tropical regions the soil is often very deep and bright red.

 

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