The Greek mathematician and geographer Eratosthenes is noted for
A) his highly precise maps of the coastlines of Mediterranean Europe and Africa.
B) calculating Earth's diameter by measuring celestial angles at two different locations.
C) inventing the concepts of time zones by dividing 360 by 24, thereby establishing 15° zones.
D) being the first to realize the spherical shape of Earth
E) reasoning that Earth's equatorial bulge was the result of Earth's rotation and centrifugal force.
B
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The wind belt observed on the poleward side of the polar front is called the ____
A) polar easterlies B) prevailing westerlies C) northeast trades D) doldrums
Which of the following is true of enzymes?
A) They shift the position of a chemical equilibrium. B) They speed up the rate of a chemical reaction. C) both a and b D) neither a nor b
Response elements respond to which of the following?
A) external stimuli B) the TATA box C) RNA polymerase D) all of these
The planet with a mass most like Earth's is
A. Mars. B. Saturn. C. Neptune. D. Venus. E. Mercury.