When we see a region of a planet that is not as heavily cratered as other regions, we conclude that
  • the surface in the region is younger than the surface in more heavily cratered regions.
  • the Caloris Basin formed toward the end of the solar system's period of heavy bombardment.
  • A) accretion B) differentiation C) radioactivity D) all of the above E) both A and B
  • the circulation of convection cells in the mantle, which dragged against the lithosphere
What is the most important factor that determines the thickness, and therefore strength, of the lithosphere?
  • Faster rotation rates produce stronger winds.
  • Earth and Venus
  • high internal temperature.
  • internal temperature
Rank the five terrestrial worlds in order of size from smallest to largest:
  • convection cells in the mantle
  • when the substance is strongly heated from underneath
  • Moon, Mercury, Mars, Venus, Earth.
  • Burning releases carbon dioxide into the atmosphere.
There are no auroras on Venus because it
  • lacks a strong magnetic field.
  • because it has a more eccentric orbit
  • gases that absorb infrared light
  • convection cells in the mantle
Volcanism is more likely on a planet that
  • lacks a strong magnetic field.
  • Faster rotation rates produce stronger winds.
  • high internal temperature.
  • has high internal temperatures.
Which internal energy source produces heat by converting gravitational potential energy into thermal energy?
  • A) accretion B) differentiation C) radioactivity D) all of the above E) both A and B
  • the surface in the region is younger than the surface in more heavily cratered regions.
  • the circulation of convection cells in the mantle, which dragged against the lithosphere
  • It is the only one that has both a partially molten metallic core and reasonably rapid rotation
How large is an impact crater compared to the size of the impactor?
  • 10 times larger
  • Earth and Venus
  • plate tectonics
  • high internal temperature.
Suppose Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be
  • because it has a more eccentric orbit
  • Moon, Mercury, Mars, Venus, Earth.
  • -23 C, which is well below freezing.
  • It is the only one that has both a partially molten metallic core and reasonably rapid rotation
Why is Mars red?
  • the surface in the region is younger than the surface in more heavily cratered regions.
  • gases that absorb infrared light
  • because it has a more eccentric orbit
  • Its surface rocks were rusted by oxygen.
Which of the following describes volcanism?
  • the eruption of molten rock from a planet's interior to its surface
  • the circulation of convection cells in the mantle, which dragged against the lithosphere
  • They were probably formed by tectonic stresses when the entire planet shrank as its core cooled.
  • oxygen
What drives the motion of the continental plates on Earth?
  • high internal temperature.
  • plate tectonics
  • convection cells in the mantle
  • because it has a more eccentric orbit
Which of the following show evidence of ancient river beds?
  • Mars
  • Venus
  • oxygen
  • Earth and Venus
Which of the following does not have a major effect in shaping planetary surfaces?
  • Mars
  • magnetism
  • Venus
  • Earth and Venus
A planet is most likely to have tectonic activity if it has
  • high internal temperature.
  • 10 times larger
  • convection cells in the mantle
  • internal temperature
The terrestrial planet cores contain mostly metal because
  • It is the only one that has both a partially molten metallic core and reasonably rapid rotation
  • the circulation of convection cells in the mantle, which dragged against the lithosphere
  • They were probably formed by tectonic stresses when the entire planet shrank as its core cooled.
  • metals sank to the center during a time when the interiors were molten throughout.
Why do we think Mercury has so many tremendous cliffs?
  • They were probably formed by tectonic stresses when the entire planet shrank as its core cooled.
  • metals sank to the center during a time when the interiors were molten throughout.
  • It is the only one that has both a partially molten metallic core and reasonably rapid rotation
  • the circulation of convection cells in the mantle, which dragged against the lithosphere
Why does Earth have the strongest magnetic field among the terrestrial worlds?
  • the surface in the region is younger than the surface in more heavily cratered regions.
  • It is the only one that has both a partially molten metallic core and reasonably rapid rotation
  • They were probably formed by tectonic stresses when the entire planet shrank as its core cooled.
  • Burning releases carbon dioxide into the atmosphere.
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