The volume of miners and industries using copper in the 20th century presented an exponential growth. Mining tends to extract the highest grade resources first, once they are the most profitable. With the intense activity achieved during the last century, the higher grade non renewable sources were quickly depleted, forcing the industry to start exploring lower grades sources to satisfy the demand.
It is also noteworthy that mining copper of higher quality causes more damage to the environment, having its protocols and restrictions consequently addressed by the legislation. Therefore the costs of mining 5% copper might be outweighed by a higher margin of profit from 0.5% copper which also is less damaging to the environment.
The question your asking is asking for your opinoin so you can put what you want
Answer:
the abacus, the sundial, and the Kongming lantern
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Answer:
I think the answer is D because the others don't make much sense
Explanation:
this is what g.o.o.g.l.e has to say on the matter -->
In the ratification debate, the Anti-Federalists opposed to the Constitution. They complained that the new system threatened liberties, and failed to protect individual rights.
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<span>She goes to Friar Laurence for help.</span>
