When an object falls through the air, its velocity increases and its acceleration
A) increases.
B) decreases.
C) remains the same whether in the air or in a vacuum.
B
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Which statement best describes the motion of North America during the Cenozoic?
The refraction of sound is due to changes in wave
A. speed. B. frequency. C. direction. D. all of the above
Which soil profile contains material leached from other horizons?
A. A B. B C. C D. D
Which of the following scenarios best describes the creation of the lahars associated with the eruption of Mt. St. Helens in 1980?
A) Hot gases melted the volcano's snowcap, generating meltwater that mixed with ash. B) A volcanic flank collapsed in a landslide, which flowed into Spirit Lake. C) Ash deposited during the eruption was remobilized by a flood years later. D) The eruption deposited fine ash in the Toutle River.