What would have happened to the earth if the Sun were significantly larger than it is?
A) Liquid water and the water cycle would not exist.
B) Our atmosphere would consist mainly of carbon dioxide.
C) Our atmosphere would consist mainly of nitrogen.
D) Our Sun would have burned out after a few hundred million years so life would not evolve.
D
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Which of the following countries has the fastest growing population?
a. China b. United States c. France d. Great Britain e. Germany
The Proterozoic comprises what percentage of geologic time?
a. 12 percent d. 42 percent b. 19 percent e. 65 percent c. 35 percent
Long, parallel ridges of sand aligned parallel to the wind direction are:a
longitudinal. b. transverse. c. barchan. d. parabolic. e. none of the above
Waves often strike the shore at an angle, but the backwash is directly back into the water. The resulting zigzag movement of sand down the beach is called _________.
A. longshore drift B. wave refraction C. swashbucklers D. rip current E. barrier island