Updrafts responsible for the formation of thunderstorm clouds are most likely to occur with which combination of conditions?
A. Low-level cool, dry air; upper-level cool dry air
B. Low-level cool, dry air; upper-level warm moist air
C. Low-level warm moist air; upper-level cool, dry air
D. Low-level warm, moist air; upper-level warm, moist air
C. Low-level warm moist air; upper-level cool, dry air
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Niagara Falls were formed ________
A) by humans damming of the St. Lawrence River B) during Precambrian time approximately a billion years ago C) so long ago that the river's knickpoint is now gone D) after the retreat of the Pleistocene ice sheets a few thousand years ago E) after a series of spectacular earthquakes which are still helping the falls evolve
Which have the longest wavelengths when traveling in a vacuum?
A. X-rays. B. Light. C. Radio waves. D. all the same
What criteria are used to correlate rock units in different areas? What will be an ideal response?
Since 1990, the world has seen a rapid resurgence of tuberculosis (TB). Describe the factors that account for this recent spread.
What will be an ideal response?