Why did the discovery of Martian "blueberries" suggest the presence of water on Mars?
A. Plant life must have water to grow.
B. They were found in an ancient seafloor on Mars.
C. "Blueberries" on Earth form by the deposition of minerals in water.
D. None of these choices is correct.
Answer: C
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The process of convection occurs in
A) solids. B) liquids. C) gases. D) fluids. E) none of the above
What was the "best" dark matter percentage?
A.) 40%. B.) 50%. C.) 60%. D.) 70%. E.) 80%.
Based on its surface features, the most important event on Venus in the past billion years or so was
A) a global "repaving" that erased essentially all the surface features that had existed earlier. B) the eruption of a giant volcano that formed one of Venus's "continents." C) the impact of an unusually large asteroid that left a deep scar on one side of the planet. D) the onset of mantle convection, which caused Venus's lithosphere to split into plates like those on Earth.
The two rigid objects shown in the figure below have the same mass, radius, and angular speed. If the same braking torque is applied to each, which takes longer to stop?