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Chapter 27 - Man and his Environment - 8
1.
_______ is a treasure of all types of resources essential to maintain life on earth.
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2.
_______ resources are such type of resources, which one can use again and again.
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3.
_______ effect and acid rains are global effects of the pollution.
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4.
Industrial chemical wastes inhibit the natural purification of water carried out by _______.
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5.
Only 30 % of earth is _______.
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6.
In general, _______ refers to all non-cultivated plants and non-domesticated animals.
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7.
_______ is the cheapest and non-pollutant source of energy.
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8.
_______ is a moving air.
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9.
Nuclear energy is obtained from nuclear fuels by _______.
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