What are the orbital parameters that have generated the pleistocene glacial cycles?

an economic of depression

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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