Soil Components
Soil Layers
Soil Formation
Soil Conservation
Soil Extras
100
They are tiny particles of soil that hold water well and provide nutrients.
What is clay.
100
It is made of humus which adds nutrients. Plants grow here, so there is often many roots.
What is topsoil?
100
The breaking down of rock and soil.
What is weathering?
100
Saving and protecting soil by preventing erosion and pollution.
What is soil conservation?
100
Materials that plants and animals need to live and grow.
What are nutrients?
200
It is made up of small grains of worn-down rock. It has very few nutrients and does not hold water well.
What is sand?
200
The layer of soil that is solid rock. It has also been formed over a long period of times.
What is bedrock?
200
The movement of soil from one place to another.
What is erosion?
200
This type of farming was used in Greece and China because of hills and mountains.
What is terrace growing or farming?
200
Materials that come directly from the Earth and are useful to humans.
What are natural resources?
300
It is made up of decayed matter (decomposing plants and animals).
What is humus?
300
A natural product of subsoil and bedrock.
What is topsoil?
300
Water freezing in rocks and breaking them apart is an example.
What is weathering?
300
Many people make these by piling up things like vegetable peels and fruit skins and letting them decay.
What are compost heaps?
300
It is an important natural resource because it supports the growth of a lot of food.
What is soil?
400
It is made up of very small broken pieces of rock. Particles are bigger than clay but smaller than sand.
What is silt?
400
The deep layer of soil that forms over a long period of time.
What is subsoil?
400
It is used in rivers and streams to smooth rocks and carry pieces to new places.
What is water?
400
Some farmers do this to slow down the wind, so the wind will not blow away the top soil.
What is planting trees?
400
These are a natural way to get rid of garden pests in place of pesticides.
What are friendly insects?
500
It adds many nutrients to the soil and is found in topsoil.
What is humus?
500
It contains leaves, twigs, and animal waste.
What is ground cover?
500
Wind blows sand onto rocks and breaks off pieces of rock is an example.
What is weathering?
500
Terraced farming and contour farming prevent this from happening.
What is erosion?
500
An important job of worms.
What is stirring the soil?
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