Oceanic crust is primarily composed of ________
A) obsidian and pumice
B) granite and diorite
C) basalt and gabbro
D) basalt and granite
Answer: C
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An increase in thick and continuous clouds at low altitudes could warm the lower atmosphere and increase surface warming
Indicate whether the statement is true or false
Atmospheric motions are mostly horizontal because
A) gravity restricts vertical motions B) the atmosphere is very heavy C) its shallowness doesn't allow large vertical motions D) the oceans restrict vertical air motions
One of the postulates of Dalton's theory was incorrect. Which of the following best describes the effect of the incorrect postulate?
A) Since one postulate was incorrect the theory must be discarded. B) The theory can still be used because the erroneous postulate does not have any effect on the physical properties of the elements. C) The theory can still be used because the erroneous postulate does not have any effect on the chemical properties of the elements. D) The theory can still be used because the erroneous postulate does not have any effect on either the chemical or physical properties of the elements.
The San Andreas fault in California is not a simple crack but ________.
A. exists as a single line of breakage along most of its length B. exists as a zigzag crack along most of its length C. shows little offset on the surface but greater offset below the surface D. is not connected to other fault systems E. a belt of broken and ground-up rock, usually 100 m or more in width