Two objects move toward each other because of gravity. As the objects get closer and closer, the acceleration of each
A) increases.
B) decreases.
C) remains constant.
A
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Consider the escape speed for a rocket on the Moon returning to Earth. Escape speed from Moon to Earth is
A. less than from Earth. B. about the same as from Earth. C. more than from Earth. D. none of the above
Some scientists have suggested that human intervention in the Earth system has been responsible
for a new epoch of geologic time called the Anthropocene. Indicate whether the statement is true or false.
Joann, a marine scientist, is studying the amount of dissolved iron, nitrate, and phosphate in the upper water column of
the open ocean to determine if nutrients are limiting phytoplankton growth. What kind of marine scientist is she? a. physical oceanographer b. chemical oceanographer c. marine biologist d. marine geologist e. marine engineer
The average Earth density is ________ the mantle density
A) unrelated to B) equal to C) less than D) greater than