which
is a material that is useful and valuable for humans.
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materials and substances become useful if we use them properly and with knowledge of the outcome. Explanation: We make materials that harm the planets because we don't handle them properly, but if we use them properly we can make them more useful and possibly not harmful.
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Answer:
water and gas
Explanation:
H2O is a very important and valuable resource. It is used for drinking, washing, cooking etc.
Gas is limited and it is used by everyone on a daily basis.
Eg - Driving cars uses gas
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