The lithosphere
A. extends to an average depth of about 300 kilometers.
B. is thickest under the continents, thinnest beneath the oceans.
C. was discovered by studying the behavior of seismic waves generated by earthquakes.
D. is partly molten and plastic in consistency.
Answer: B
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The price of fuel for vehicles is determined by
A. taxes. B. political events in oil producing countries. C. supply and demand. D. All of the options are true.
What is the definition of magma mixing?
A) When magma mixes with fluids to become more dilute B) When rising magma melts surrounding country rock and incorporates it C) When one rising magma will overtake a second and the two intermix D) When magma incorporates more dissolved gases
If a stream originates in a humid region, but subsequently flows through an arid region, discharge is likely highest
A) when it reaches ultimate base level. B) downstream. C) upstream. D) midstream. E) at an estuary or confluence with another stream.
Which of the following resources found in ocean sediments has the greatest economic value?
A) Gas hydrates B) Manganese nodules and crusts C) Petroleum D) Rare-earth elements E) Sand and gravel