The puzzle-like fit of the continents, similarity of rock types across continents, and glacial evidence all were pieces of evidence supporting Wegener's hypothesis of continental drift. What was another piece of supporting evidence?
A. land bridges were discovered connecting Africa and South America
B. continents were found to have plowed through ocean basins to move into current positions
C. distribution of similar fossils across multiple continents
D. gravitational pull of the Moon was found to be responsible for connecting Pangaea
Answer: C
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All of the following are reasons why freshwater resources are so scarce except for the following:
A) Global warming has dried up most of our global freshwater resources. B) Most of the planet's water is too salty to be used efficiently. C) Many of our freshwater resources are too polluted to be used safely by humans. D) The majority of our freshwater resources is frozen and located far from human habitation.
Most photosynthesis in the open ocean occurs in the ____.
A. abyssal zone B. euphotic zone C. estuary zone D. bathyal zone E. benthic zone
The dry midlatitude climate experiences a smaller annual temperature range than the marine west-coast climate.
a. true b. false
Compared to the others, which of the following has the boundaries the "hardest to pin down"?
A) Atmosphere B) Biosphere C) Lithosphere D) Hydrosphere E) Magnetosphere