The ultimate cause of tectonic plate motion is the
A) second law of thermodynamics.
B) tendency for heat to spread out.
C) escape of heat from Earth's interior.
D) all of the above
D
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Atmospheric carbon dioxide concentrations: [INSERT FIGURE 1-6. NO CAPTION]
A) have decreased over the last few decades. B) increase with height above the tropopause. C) have not been reliably measured for the northern hemisphere. D) are highest in early spring.
Metamorphism is related to Plate Tectonics. For example, both the continent-continent collisions and subduction zones can cause metamorphism.
a. true b. false
Since the 1980s, U.S. savings rates have remained steady at 4%
Indicate whether the statement is true or false
Of the following numbered units, which is the oldest?
A. gravels along the river (7) B. a sedimentary layer (2) C. the volcano and lava flow (9) D. the highest sedimentary layer (11) E. the granite (4)