Given the pH scale is logarithmic where each whole number represents a tenfold increase, a rain with a pH of 3 is how many times more acidic than rain with a pH of 7?
A) 3
B) 4
C) 100
D) 10,000
E) 1,000,000,000
D
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A felsic igneous rock metamorphosed to low metamorphic grade would become a(n)
A) schist. B) amphibolite. C) gneiss. D) slate.
The crossopterygians were well-adapted to move onto the land because they had ____
A)lungs, but not necessarily a means for locomotion B)a means for locomotion, but not necessarily lungs C)cartilaginous skeletons D)lungs and a means of locomotion E)webbed feet
Which of these regions is mostly covered with grasslands?
A) llanos of Venezuela B) cerrados of Brazil C) pampas of Argentina D) all of the above E) none of the above
_____ is defined as the ratio of water vapor in the atmosphere compared to the amount the atmosphere could contain
a. Atmospheric pressure b. Ozonification c. Temperature d. Relative humidity