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Volcanic rock (often shortened to volcanics in scientific contexts) is a rock formed from lava erupted from a volcano. ... Volcanic rocks and sediment that form from magma erupted into the air are called "volcaniclastics," and these are technically sedimentary rocks.
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I am pretty sure the answer is <span>d. all of the above.
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A theory proposed by Harold Hotelling states that owners of nonrenewable resources will only produce that resource if it wills the yield will have more value than other financial instruments available in the market, such as interest bearing securities and bonds. This assumes such owners are only motivated by profit and that markets are efficient. The theory is used by economists to predict the price of nonrenewable resources like oil, based on prevailing interest rates.
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