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Question
A stream becomes graded whenA) erosion and deposition are in equilibrium.
B) a local base level controls the stream.
C) a river achieves a longitudinal stream profile of a steeper upstream portion.
D) its basin becomes rejuvenated.
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.
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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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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.
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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.
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