What evidence is used to support the theory of plate tectonics? a. the continental drift hypothesis
b. the process of erosion and deposition
c. the presence of molten iron in earth’s core
d. the magnetic reversals found in the oceanic crust

answer: mining of copper is a good thing because ,it is not carcinogenic to environment.copper resources are estimated at nearly 5.8 trillion pounds of which only about 0.7 trillion pounds (12%) have been mined throughout history.yes copper is the best metal for conducting electricity as it is used in electric wires.if someone falls into a mine he or she may get hurt if they do not wear any safety equipments or fall accidently, it depends on how shallow or high is the mine . the actual cost of a dump truck varies significantly depending on the truck itself, with a range between $100,000 to $150,000 for a new purchase, and a drastic swing between $15,000 to $100,000 for a used purchase.

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