A place where an unusually hot part of the mantle rises through the crust causing volcanic activity is called
A. Divergent boundary
B. Hot spot
C. Convergent boundary
D. Transform boundary
Answer: B. Hot spot
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Modern evidence based on what can be determined about the products of nuclear reactions in the first few minutes after the big bang shows that dark matter:
A) does not have any density. B) does not exist. C) is not present in galaxies. D) is not baryonic.
YSOs are in hydrostatic equilibrium
a. True b. False Indicate whether the statement is true or false
Motion in a circle at constant speed is motion with
a. constant acceleration. b. constant velocity. c. both of the above d. none of the above
What happens to a star's core as the hydrogen there is used up?
A. Nothing. It just turns to helium. B. It contracts and cools. C. It contracts and heats. D. It expands and cools. E. As the helium accumulates, the core rises to the surface of the star and escapes into space.