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Contents
9G Environmental Chemistry
Soil chemistry
Rocks and weathering
Acid rain
Greenhouse effect
Summary activities
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What is soil?
A layer of soil covers much of the
Earth's surface. What is soil made
up of?
weathered rock particles
decaying remains of dead plants
and animals (called humus)
water
air
living things, including plants
and animals such as worms
Plants need soil to grow. How does soil support plant growth?
Soil supplies plants with water and important nutrients and
also helps to anchor roots.
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How are soils different?
Soils in different areas are different.
What factors affect the composition
and properties of different soils?
The weathered rock particles
come from different types of
rock and can vary in size.
The amount of humus can vary
depending on the plants and
animals that lived in the soil.
The amount of water in the soil is affected by the type of
rock particles. Clay particles are much smaller than sand.
A clay soil is heavier and contains more water than a
sandy soil which contains lots of room for air.
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pH of different soils
Different soils have different pHs.
Soils have different pHs because they
are made up of different rocks and so
contain different chemicals.
The pH of soil affects the availability of nutrients and plants
prefer to grow in soilsFor
of a certain pH.
example, strawberries prefer acidic
soil and plums prefer alkaline soil.
Why do farmers and gardeners need to check soil pH?
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Soil pH experiment
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