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Question
An important condition for the formation of coal is ________.A) abundant plant and animal life in a region
B) decomposition of organic matter with abundant oxygen
C) incomplete decomposition of organic matter due to a lack of oxygen
D) acid rich waters that reduce the organic matter to pure carbon
Answer
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Related questions
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A) coal
B) ice
C) helium gas
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A) reserve
B) ore
C) resource
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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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Use the Periodic table below to answer the following questions: When electrons are shared amongst all atoms, the resulting bond is a(n) ________ bond.
A) covalent
B) ionic
C) partial
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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.
C) It behaves as a nonmetal, accepting electrons to form an ion with charge -2.
D) It tends to be inert, and thus is dispersed throughout the crust.
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A) outer electron shell because these electrons can be readily exchanged with adjacent atoms
B) innermost electron shell because the electrons can be transferred to the nucleus
C) middle electron shell because they are intermediate in distance between the nucleus and the adjacent atom that bonds with the atom
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?
A) the biosphere
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B) heat from Earth's interior
C) both A and B
D) none of the above
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A) negative feedback mechanisms
B) positive feedback mechanisms
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A) deep-ocean trenches
B) oceanic ridges
C) seamounts
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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
D) ancient coastal regions that have become abandoned and eroded
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A) along coastlines
B) near desert regions
C) in the interior of continents
D) in areas that receive large amounts of rainfall
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A major cause of the differences in elevation between ocean basins and continents is ________.
A) viscosity
B) temperature
C) density
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A) subduction
B) sea floor spreading
C) back-arc contraction
D) continental collision
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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