The main reason why the hypothesis of continental drift was not widely accepted was
A. there was no mechanism to move continents through the oceanic crust.
B. the hypothesis required that the entire Earth was once frozen.
C. the hypothesis required long, narrow land bridges that did not exist.
D. All of these were reasons the hypothesis was not widely accepted.
Answer: A
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The conversion of solar energy into chemical energy occurs in
a. Photosynthesis b. food chains c. Chemosynthesis d. heterotrophic organisms e. food webs
If three samples have the half-lives listed below, which is the most radioactive?
A. a sample with a half-life of 20 years B. a sample with a half-life of 20 minutes C. a sample with a half-life of 20 million years D. a sample with a half-life of 20 hours E. none of the above
The climate of the tropical rain forest biome is best described as
A) consistently warm and wet. B) consistently warm, but seasonally dry. C) having a distinct cold and warm season. D) mild winter with a very hot summer.
One significant difference between oceanic and continental crust in terms of the long term evolution of the earth's surface is that ________
A) continental crust is more uniform in composition than oceanic crust B) oceanic crust contains more radioactive elements that contribute to the heating of the earth. C) oceanic crust is less dense than continental crust D) oceanic crust preserves a history of ancient deformation better than continental crust E) continental crust is harder to subduct than oceanic crust