On earthquake distribution maps, the boundaries of the Earth's tectonic plates are shown as zones of high seismic activity.
a. true
b. false
Ans: a. true
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Surface waves are useful for investigating Earth's interior because they
A. reflect at the boundaries between Earth's layers. B. cast shadows indicating Earth's layers. C. refract at the boundaries between Earth's layers. D. none of the above
Which emits radiation of the highest frequency?
A. The Sun. B. A blue-hot star. C. A red-hot star. D. all the same
Sustainability ________
A) is impossible to accomplish B) is possible given our increased use of fertilizers and technology for agriculture C) is beyond our current technology and attitudes D) ensures an economy that will decline over time E) involves using resources without compromising future availability
In which part of the Caribbean is the forest cover largely intact?
A) island states B) rimland states C) In no part of the Caribbean is the forest cover largely intact. D) throughout the region E) Puerto Rico