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Question
The very large crystals of quartz, feldspar, and muscovite found in pegmatites form from ________.A) the early crystallizing parts of a magma
B) the final crystallizing parts of a magma
C) the middle crystallizing parts of a magma
D) all of the above
Answer
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Related questions
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A) coal
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C) helium gas
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A) reserve
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A) luster
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What does the tendency of micas to produce thin cleavage flakes suggest about its crystal structure?
A) The crystal structure is characterized by complex polymerized mats that form a sheetlike structure.
B) The structure is characterized by rings that form an interlocking network, forming planar sheets.
C) The structure is produced by flow in the igneous rock, aligning glass layers within the crystal structure.
D) The atoms are arranged in orderly arrangements that form strongly bonded sheets separated by weak bonds between the sheets.
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B) ionic
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Use the Periodic table below to answer the following questions: Element 20, Ca, has what chemical property?
A) It behaves as a metal ion, giving up two electrons to form a +2 ion.
B) It tends to form covalent bonds and an ion with a charge of +1.
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D) It tends to be inert, and thus is dispersed throughout the crust.
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B) innermost electron shell because the electrons can be transferred to the nucleus
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D) Any electron can exchange with adjacent atoms to form a bond; there is no preference.
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Which of the following is not a system?
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B) heat from Earth's interior
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A) deep-ocean trenches
B) oceanic ridges
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B) flat areas that include rocks older than 1 billion years old
C) flat river valleys that cut through older mountain ranges
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A) along coastlines
B) near desert regions
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D) in areas that receive large amounts of rainfall
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A) viscosity
B) temperature
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B) sea floor spreading
C) back-arc contraction
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A) Lithosphere
B) Asthenosphere
C) Lower mantle
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A) hot spots on the sea floor, like Iceland
B) spreading ridges
C) convergent plate margins
D) transform plate margins