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Question
Why would astronomers place an X-ray observatory in space, like the Chandra observatory?A) to map X-ray emissions from the moon
B) to map X-ray emissions from the sun
C) to record X-rays emitted from the big bang; the so called background radiation of the universe
D) to map deep X-ray emissions from deep space, particularly as a proxy for materials being sucked into black holes
Answer
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Related questions
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Cleavage is related to the internal structure of a mineral.
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A) coal
B) ice
C) helium gas
D) rock salt
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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.
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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.
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
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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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D) the Pacific Ocean and the west coast of North America
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B) heat from Earth's interior
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D) none of the above
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A) negative feedback mechanisms
B) positive feedback mechanisms
C) closed feedback mechanisms
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A) deep-ocean trenches
B) oceanic ridges
C) seamounts
D) lava plateaus
Q:
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A) linear chains of mountains less than 100 million years old
B) flat areas that include rocks older than 1 billion years old
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Flat, stable areas of continental crust tend to be located ________.
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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The Andes Mountains in South America are formed by ________.
A) subduction
B) sea floor spreading
C) back-arc contraction
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A) Lithosphere
B) Asthenosphere
C) Lower mantle
D) Outer Core
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A) hot spots on the sea floor, like Iceland
B) spreading ridges
C) convergent plate margins
D) transform plate margins