The stars in our sky twinkle in brightness and color because of ________
A) rapid changes in the brightnesses and colors of stars caused by changes in their spectra
B) turbulence in the Earth's atmosphere
C) the bubbling and boiling of gases on the surfaces of stars
D) light pollution
B
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The Coriolis effect demonstrates that Earth spins.
Answer the following statement true (T) or false (F)
A heat pump can
A) cool an environment. B) warm an environment. C) both of these D) neither of these
The coma around the nucleus of a comet can be 10 times the size of Earth.
Answer the following statement true (T) or false (F)
The most striking example of solar variability was the
A) Dust Bowl drought of the 1930s. B) Maunder Minimum from 1645-1715. C) Sporer Minimum that doomed the Anasazi. D) fall of Rome. E) Joseph's seven lean years in the Old Testament.