The tiny particles that make up matter are mostly
A. molecules.
B. atoms.
C. both of these
D. none of the above
Answer: D
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An object raised 5 m gains a certain amount of potential energy. If it is raised 10 m, its gain in potential energy is
A. twice as much. B. less. C. four times as much. D. the same.
When the air is saturated, which of the following conditions occurs?
A. The air temperature equals the wet-bulb temperature. B. The relative humidity is 90 percent. C. A decrease in temperature causes condensation to occur. D. The air temperature is lower than the dew point temperature.
Maritime air masses have a higher water vapor content than continental air masses
Indicate whether the statement is true or false
About one-third of the toxic metal, mercury (Hg), is released into the air from natural sources, such as rocks, soil, volcanoes, and the ocean. The remaining two-thirds come from human activities such as ____.
A. automobile exhaust B. airplane exhaust C. plastic recycling D. gold mining E. livestock farming