Isaac Newton reasoned that Earth was not perfectly spherical because of
A) centrifugal force created by Earth's more rapid rotation at the equator.
B) centrifugal force created by Earth's more rapid rotation at the poles.
C) gravitational force created by Earth's more rapid rotation at the equator.
D) gravitational force created by Earth's more rapid rotation at the poles.
A
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Why are some tropical waters unable to sustain life?
A) There is an addition of pollutants in many of these areas. B) There is a low level of dissolved oxygen due to temperature. C) There is a greater amount of carbon dioxide. D) There are more conservative components in these waters.
The Koeppen classification system
A) was developed in the latter part of the twentieth century. B) was revised substantially by Koeppen over a period of nearly 20 years. C) has two broad categories of climates. D) is not the most widely used such system.
Sixteen of the world's twenty most polluted cities are found in ____.
A. the United States B. Brazil C. the Ukraine D. China E. Mexico
What should be done after a self-closing door is forced?
a. return the door to the closed position b. allow the mechanism to resume its normal operation c. cut the actuation cable d. chock the door in the open position