How do medium stars die? Their remnants are
A: nova then white dwarf
B: supernova then white dwarf
C: planetary nebula then white dwarf
D: supernova then neutron star
E: supernova then black hole
Ans: D: supernova then neutron star
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When a vapor condenses,
A) the temperature of the substance increases. B) the temperature of the substance decreases. C) heat energy leaves the substance. D) heat energy enters the substance.
The relative size of the mantle of Earth compared to the solid inner core of Earth is most similar to:
A) the peel of an orange as compared to the meat of the orange. B) the rind of a watermelon as compared to the meat of the watermelon. C) the skin of a grape as compared to the meat of the grape. D) the meat of a peach as compared to the pit of the peach. E) the meat of a cherry as compared to the pit of the cherry.
Expressed in standard powers-of-10 notation and rounded to four significant figures, the number 0.00023648 is
a. 2.364 × 10^3. b. 2.365 × 10^4. c. 2.365 × 10^-4. d. 236.4 × 10^-6.
The Miocene is a(n)
a. epoch. b. era. c. eon. d. period.