The great variety of igneous rocks is due to _______.
Fill in the blank(s) with the appropriate word(s)
Answer: partial melting and the step-by-step process of crystallization
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Answer the following statement true (T) or false (F)
In the proton-proton cycle, the helium atom and neutrino have less mass than the original hydrogen. What happens to the "lost" mass?
A) It is recycled back into hydrogen. B) It is ejected into space. C) It is converted to energy. D) It is transformed into electrons. E) Conservation of mass dictates no mass can be lost.
Which of the four Galilean moons is least likely to harbor life beneath its surface?
A) Europa B) Io C) Callisto D) Ganymede
What aspect of Kepler's theory would have horrified all astronomers before Kepler?
A) Kepler's elliptical orbits. B) The fact that the Earth has a spherical shape in Kepler's theory. C) Kepler's simple circular orbits. D) The fact that Earth was no longer at the center. E) The absence of any epicycles [or "circles-within-circles"].