Which of the following substances can be condensation nuclei?
A. smoke from forest fires
B. pollen particles
C. phosphoric acid particles
D. salt from mines
Answer: A
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When a falling object has reached its terminal velocity, its acceleration is
A) constant. B) zero. C) g.
Because of its location, the Sundarban is especially vulnerable to this natural hazard:
A) earthquakes B) hurricanes C) blizzards D) volcanoes
The bottoms of clouds are often gray because
A) precipitation is imminent. B) they are over dark portions of the Earth's surface. C) the bottoms of clouds are denser than the tops, and thus absorb more light. D) multiple scattering has removed most light before it reaches the bottom of the cloud. E) droplets or crystals within the cloud have dispersed most of the available light.
Which of the following cloud types has the greatest height (from top to bottom)?
A) Cirrus B) Cumulus C) Altostratus D) Stratus E) Cumulonimbus