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

Environmental & Atmospheric Sciences

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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

Environmental & Atmospheric Sciences

Which have the longest wavelengths when traveling in a vacuum?

A. X-rays. B. Light. C. Radio waves. D. all the same

Environmental & Atmospheric Sciences

What criteria are used to correlate rock units in different areas? What will be an ideal response?

Environmental & Atmospheric Sciences

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?

Environmental & Atmospheric Sciences