What is a locally rich concentration of minerals that can be mined economically and is legally recoverable with existing technology?
2.What is a locally rich concentration of metallic minerals that can be mined economically and is legally recoverable with existing technology?
3.What is the ratio of an element's abundance in an ore deposit to its average continental-crustal abundance?
c.economic feasibility quotient
d.use per capita
4.If the crustal abundance of some substance is 5% and a "good" ore deposit contains 25%, what is the concentration factor needed to economically mine this substance?
5.What kind of process produces banded iron formations?
6.Which type of ore deposit originated before there was free oxygen in the atmosphere?
a.banded iron formation
d.gold placer deposits
7.What kind of process produces manganese nodules?
8.Most of the world's aluminum comes from which of the following?
9.Judge the following sentence according to the criteria given below: Aluminum is concentrated in the formation of bauxite ore BECAUSE it is relatively insoluble during the deep chemical weathering that occurs in hot, humid tropical climates.
a.The assertion and reason are both correct, and the reason is valid.
b.The assertion and reason are both correct, and the reason is invalid.
c.The assertion is correct and the reason is incorrect.
d.The assertion is incorrect and the reason is correct.
e.Both the assertion and the reason are incorrect.
10.For which of the following non-metallic mineral resources dose the United States produce more than it consumes?
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