Question # 1

What is therole of living organisms in the soil.

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Making soild soft and airy

Making soil hard

Make soil unfit for cultivations

Making the air dry

What % percentage of the earh is water

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70%

75%

72%

80%

The amount of fresh water that available to mankind is approximately to the total amount of water.

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01%

2%

3%

4%

What are the main types of the soil?

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Silt, Sand and rock

Clay, humus and sand

Sand, silt and clay

silt, humus andclay

In term of volume, largest part of the earth.

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Crust

Mantle

Core

External core

Part of the earth where we live

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Crust

Mantle

core

External core

The volume of inernal core of the earth is........... of the total volume of the earth.

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15%

16%

17%

18%

The amount of fresh water on the Earth is

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about 1 %

about 30%

about 70%

about 90%

Weight of the internal core of the earth is............ of the total weight of the earth.

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30%

16%

33%

34%

What is important in the neaural measure.

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Minerals

The decayed matter

sand

Salts

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