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Question
Following the reptilian extinctions at the close of the Mesozoic, two groups of mammals, the marsupials and ________, evolved.A) eukaryotes
B) cephalopods
C) trilobites
D) placentals
E) stromatolites
Answer
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Related questions
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Mineral luster is broadly classified as either being metallic or opaque.
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A mineral can be composed entirely of one element.
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A) coal
B) ice
C) helium gas
D) rock salt
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A naturally occurring concentration of one or more metallic minerals that can be extracted economically is a(n) ________.
A) reserve
B) ore
C) resource
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A) luster
B) color streak
C) virtual absorption
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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
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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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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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Internally, the earth consists of spherical shells with different compositions and densities.
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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
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D) none of the above
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A) deep-ocean trenches
B) oceanic ridges
C) seamounts
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C) flat river valleys that cut through older mountain ranges
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A) along coastlines
B) near desert regions
C) in the interior of continents
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A major cause of the differences in elevation between ocean basins and continents is ________.
A) viscosity
B) temperature
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A) subduction
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