Environmental Studies Worksheet-7
A. By not using them B. By polluting them
C. By using them D. By cleaning them
A. Thousands to ten thousands seconds old
B. Thousands to billions years old
C. A couple of years old
D. A few days old
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A. Breathing
B. Cooking
C. Burning of fossil fuel that produces CO2
D. Burning of nuclear fuel
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Environmental Studies Worksheet-9
A. Household waste
B. Industrial waste from factories and refineries
C. Fish in the water
D. Ultraviolet rays
A. It is hardened. B. It is imprinted.
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