Fresh water enters the ocean by runoff from streams and rivers,

A) precipitation of rain over the ocean, and evaporation of coastal waters.
B) evaporation of surface water, and melting of glacial ice.
C) precipitation, and melting of glacial ice.
D) none of these


Answer: C

Physics & Space Science

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Today, an average lunar moonquake releases about as much energy as

A) an atomic bomb. B) a firecracker. C) a major U.S. city uses in 1 year. D) the Mount St. Helens eruption. E) the most powerful earthquake ever recorded.

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Consider two cylinders of gas identical in all respects except that one contains oxygen O2 and the other helium He

Both cylinders initially contain the same volume of gas at 0°C and 1 atm of pressure and are closed by a movable piston at one end. Both gases are now compressed adiabatically to one-third their original volume. (a) Which gas will show the greater temperature increase? A. the O2 B) the He C) Neither; both will show the same increase. D) It is impossible to tell from the information given. (b) Which gas will show the greater pressure increase? A. the O2 B) the He C) Neither; both will show the same increase. D) It is impossible to tell from the information given.

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The stars of highest photospheric temperature are those of spectral class _______________

a. O b. M c. K d. C

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In the electron-wave model of the atom, an electron in the second energy level contains

A) a single wavelength. B) two wavelengths. C) any number of wavelengths. D) none of the above

Physics & Space Science