Olivine is often found in ultramafic and mafic igneous rocks, but not felsic. Explain why you wouldn't expect to find olivine form inside a granite or rhyolite
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Answer: Olivine is seldom found in felsic rocks because granite/rhyolite crystallizes at a much lower temperature than olivine. Olivine is the first mineral to crystallize when a body of magma begins to cool therefore all of the olivine would have crystallized to form peridotite. Olivine forms in a higher temperature regime than granite, refer to Bowen's Reaction Series.
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Which of the following statements describes the path of polar orbiting satellites?
A. They orient to an area west of the previous orbit on each orbit. B. They follow a line of constant latitude around the earth. C. They remain above a fixed point over the north or south pole. D. They pass directly over the same place on each successive orbit.
China's Three Gorges Dam on the Yangtze and Vietnam's Nam Theun Dam on the Mekong demonstrate that
A) large hydroelectric projects can be carried out with little to no environmental impact and human displacement. B) hydroelectric installations cannot produce enough energy to compete with fossil fuel plants. C) the air pollution from the dams will have to be monitored constantly to protect human health. D) the major impacts on downstream communities will have to be carefully studied.
Define insolation and reradiation, and describe how these interact to warm Earth
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Which of the following best describes the low pressure cell centered for most of the year over the equator?
A. consistent insolation, warm temperatures, abundant rainfall B. variable insolation, warm temperatures, variable rainfall C. consistent insolation, varying temperatures, variable rainfall D. variable insolation, warm temperatures, abundant rainfall