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Geochemistry: Quiz

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Question 1: An important subdivision of these contains a very high percentage of alkalis, especially soda, and consequently has minerals such as nepheline and ________ not common in other rocks.
BasaltIgneous rockLeuciteTuff

Question 2: In some cases they may take other forms, such as nepheline, ________, and muscovite, but in the great majority of instances they are found as feldspar.
TuffBasaltIgneous rockLeucite

Question 3: ________: Determination of the relative and absolute concentrations of the elements and their isotopes in the earth and on earth's surface.
Geologic time scaleRadiocarbon datingIsotope geochemistryRadiometric dating

Question 4: Those again that contain least silica and most magnesia and iron, so that quartz is absent while ________ is usually abundant, form the "basic" group.
ForsteriteBasaltIgneous rockOlivine

Question 5: The more common rock constituents are nearly all oxides; ________, sulfur and fluorine are the only important exceptions to this and their total amount in any rock is usually much less than 1%.
OxygenNitrogenChlorineHydrogen

Question 6: Magnesium carbonate and iron oxides with silica crystallize as ________ or enstatite, or with alumina and lime form the complex ferro-magnesian silicates of which the pyroxenes, amphiboles, and biotites are the chief.
OlivineBasaltForsteriteQuartz

Question 7: Any excess of silica above what is required to neutralize the bases will separate out as ________; excess of alumina crystallizes as corundum.
OpalQuartzAgateAmethyst







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