Whose expedition was the first to circumnavigate the globe?
a. Ferdinand Magellan
b. Christopher Columbus
c. Prince Henry the Navigator
d. James Cook
e. Matthew Maury
a
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The average slope of the continental shelf is approximately ________
A) a tenth of a degree B) one-half to one degree C) one to two degrees D) two to five degrees E) greater than five degrees
Occasionally, a volcano will spew large amounts of fine volcanic dust into the high atmosphere. This dust can have the effect of ________.
A. causing unusual weather B. reducing the sunlight that reaches Earth's surface, suppressing photosynthetic processes C. reducing Earth's surface temperature D. damaging aircraft that fly through the dust E. All of the answers are correct.
The sections of Earth's crust that float on top of the mantle are known as ________
A) stratosphere B) lithosphere C) ozone layer D) tectonic plates E) oceans
Paleontologists estimate that ________
A) extinction is tied exclusively to human activities B) more than 99% of all species alive today have been discovered and described C) 99% of all species that have ever existed are now extinct D) biodiversity is evenly spread over the earth's biomes