A form of precipitation that results from convection cycles in clouds is
a. sleet.
b. rain.
c. hail.
d. fog.
c
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On a planet in the solar system where the sky normally scatters light of lower frequencies, its sunsets would be
A) reddish. B) yellow-greenish. C) bluish. D) whitish.
On of the greatest debates is the intellectual history of mankind was whether the geocentric or heliocentric cosmos was correct. Who was it proposed by?
a) Pyrhagoras b)thayles c)Aristarchus
The early atmosphere of Earth had more methane and ammonia than what is present today. Where did these gases go?
A. Methane and ammonia dissolved in Earth's oceans. B. Sunlight broke methane and ammonia apart and the hydrogen escaped to space. C. Plant life converted methane and ammonia to nitrogen and carbon through photosynthesis. D. Cometary and planetesimal impacts provided enough energy for these gases to escape to space.
Below is a radial velocity curve for a spectroscopic binary. Which of the stars is most massive? ____________________