What percentage of the rocks exposed on the continents originated as sedimentary rocks deposited in ancient ocean environments?
A) Less than twenty percent
B) Twenty to thirty percent
C) Thirty to forty percent
D) Forty to fifty percent
E) More than fifty percent
E
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Today, ____ of the world's population and ____ of the U.S. population live in urban and suburban areas.
A. 52%; 82% B. 20%; 75% C. 82%; 52% D. 90%; 87% E. 100%; 100%
Many terranes are composed of oceanic crust and originated as seamounts. Indicate whether the statement is true or false
A hypothesis is a(n)
A. proposed explanation developed before formal investigation. B. question developed that leads to an observation. C. strategy for solving a scientific problem. D. conclusion based on results of an investigation.
Which of the following is NOT true regarding clay minerals?
A. Precipitate out of magmas. B. Are extremely small compared to sand-sized grains. C. Are a rock forming mineral group. D. Form when feldspar and ferromagnesian minerals break down. E. Are a major component of soils.