The oldest rocks are found
A) at convergent boundaries.
B) at divergent boundaries.
C) in the ocean basins.
D) on continental land.
Answer: D
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a. Protostar, pre-main-sequence b. Protostar, white dwarf c. Protostar, main-sequence d. Main-sequence, white dwarf
The following statements are all true. Which one counts as an "exception to the rule" in being unusual for our solar system?
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Kirkwood gaps in the asteroid belt occur at distances where
A) the density of asteroids is high enough for a large collision to pulverize a number of asteroids. B) the period of an orbiting asteroid would be a simple fraction (like 1/3 or 1/4 ) of Jupiter's orbital period. C) the period of an orbiting asteroid would be the same as Mars's orbital period. D) the orbit would take the asteroid beyond the "frost line" in the solar system. E) the period of an orbiting asteroid would be the same as Jupiter's orbital period.
Which of the following describes an object that is accelerated?
A) A car slowing down while moving along a straight line B) A car rounding a curve at a steady 80 km/hr C) Both of the above. D) A car moving up a straight hill [a hill whose "slope" is unchanging] at a steady 80 km/hr, when the car is midway up the hill E) All of the above.