Why is methane gas the least abundant gas in magmas?
A) Methane is only found deep within the earth.
B) Methane is repelled by heat.
C) Water vapor, carbon dioxide, and odorous sulfur compounds are the primary gases.
D) Methane turns to liquid in the presence of magma.
Answer: C
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Why are ferromagnesian minerals easily weathered?
A) they are rich in magnesium B) they are prone to oxidation C) they are formed during the solidification of magma D) they are prone to dissolution
Which of the following observations lends itself best to scientific experimentation?
A) Archaeopteryx had a dinosaur-like skeleton but also had feathers. B) Male house finches seem to sing more when there is a female house finch around than when they are alone. C) My sister does not drive very well. D) Someone egged my house last night.
Multiplying 1.25 by the square root of the wavelength results in the velocity of a ________.
A. tsunami in shallow water B. wind-blown wave in deep water C. wind-blown wave in shallow water D. tsunami moving onshore E. tsunami in deep water
Earlier we discussed the concept of isostasy, where lower density rocks rise higher than higher density rocks. How is the variation of water depth at spreading centers (ridges) controlled by isostasy?
A) The lithosphere cools as it moves away from the ridge axis by sea floor spreading, and cooler rocks are lower density, so the sea floor gets deeper as the lithosphere gets more dense. B) Volcanic rocks are lighter than other rocks, and so the abundant volcanic rocks at the ridges are lower density features that produce the seafloor topography. C) It has nothing to do with isostasy; the areas are simply high because there are chains of active volcanos along the ridge crest, producing the topography. D) Oceanic ridges are sites where the lithosphere is carried into the mantle on one side (aka subduction zones), and the volcanos along these margins produce the ridge by buildup of lower density crust.