A scientist identifies a rock sample as basalt. Why did he do so?
A) He observed that the rock has a lot of silica, making it mafic.
B) He observed that the rock has a lot of silica, making it ultra-mafic.
C) He observed that the sample has little silica, making it felsic.
D) He observed that the sample has little silica, making it mafic.
Answer: D
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Which of the following is characteristic of oceanic-continental convergent plate boundaries?
A) Andesitic volcanoes B) Fracture zones C) Hot spots D) Mid-ocean ridges E) Volcanic island arcs
Which of the following is the most correct definition of soil?
A. A complex of minerals that provide energy for the growth of plants B. A complex mixture of organic matter, minerals, and living organisms C. An elaborate mixture of organic matter and minerals D. A mass of dead organic matter and detritus: dirt E. All of these adequately describe soil
If sunlight were green instead of white, the most comfortable color to wear on a hot day would be
A. green. B. yellow. C. violet. D. magenta. E. blue.
Oxygen (O2 ) is
A) a by-product of photosynthesis. B) a gas which principally originates from volcanic sources. C) now measured at 78.084% by volume in the homosphere. D) one of the gases from Earth's earliest atmospheres.