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Question
The gaseous oxygen in the Earth's atmosphere was produced as a by-product ofA) volcanic outgassing.
B) photochemical reactions breaking down ozone (O3) to form oxygen (O2).
C) photosynthesis.
D) decay of organic matter.
Answer
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Related questions
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The key idea behind the scientific method is
A) the use of intuition in testing theories.
B) an appeal to supernatural explanations when natural explanations have not yet been found for a phenomenon.
C) the testing of ideas through controlled observations and experiments.
D) unbridled speculation about the world.
Q:
Which of the following is the most strongly supported by experimental and observational evidence?
A) speculation
B) hypothesis
C) educated guess
D) theory
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In order to study the planetesimal hypothesis, astronomers study this process in other parts of the Galaxy.
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The Milky Way is about 100,000 light-years from side to side.
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The Solar System, Sun, and Earth formed about 4.6 billion years ago.
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The longest days of the year in the Southern Hemisphere are experienced during the Northern Hemisphere's
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Distinguish between active and passive remote sensing, and describe the applications of each.
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C) It is not connected to the overlapping inorganic spheres.
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Which of the following is true of the biosphere?
A) It is never referred to as the ecosphere.
B) It exists on other planets in the solar system.
C) It is not connected to the overlapping inorganic spheres.
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Living systems are considered
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A large flood in a river may cause abrupt shifts leading to the carving of a new channel. The point at which this change occurs is a(n)
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A) representative fraction.
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C) written scale.
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The transformation of a spherical global to a 2D surface is a
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B) cone.
C) map projection.
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B) graphic scale.
C) written scale.
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A) a small circle.
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C) a prime meridian.
D) a line of equal longitude.
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A) earlier than
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