Comparing the Mass and Density of the Moon and Earth
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Questions and Answers

What is the Moon's mass compared to Earth's mass based on the text?

  • 1/120
  • 1/80 (correct)
  • 1/60
  • 1/100

    • What does the Moon's average density of 3300 kg/m3 compared to Earth's 5500 kg/m3 suggest?

  • The Moon contains fewer heavy elements than Earth. (correct)
  • The Moon is denser than Earth.
  • The Moon contains more heavy elements than Earth.
  • The Moon has a similar composition to Earth.

    • Which statement is true about the force of gravity on the Moon and Mercury compared to Earth?

  • Gravity on the lunar surface is about 1/6 that on Earth. (correct)
  • Gravity on Mercury is about 2x stronger than Earth.
  • Gravity on the Moon is stronger than on Earth.
  • Mercury's gravity is the same as Earth's.

    • Why do astronomers believe that the Moon and Mercury do not have appreciable atmospheres?

    <p>The low escape velocities of both bodies make it hard to retain atmospheres.</p> Signup and view all the answers

    What would be the weight of an astronaut weighing 180 lbs on Earth when on Mercury?

    <p>72 lbs</p> Signup and view all the answers

    What is the Moon's escape velocity compared to Earth's escape velocity based on the text?

    <p>2.4 km/s compared to 11 km/s</p> Signup and view all the answers

    What is the size range of craters found on the Moon's surface?

    <p>From 50 km to 500 m in diameter</p> Signup and view all the answers

    Where are craters more prevalent on the Moon's surface?

    <p>In the highlands</p> Signup and view all the answers

    What are the names of the Moon's mountain ranges primarily inspired by?

    <p>Terrestrial mountain ranges</p> Signup and view all the answers

    What is notable about the far side of the Moon?

    <p>It is composed almost entirely of highlands</p> Signup and view all the answers

    Why is the lack of major maria on the far side of the Moon significant?

    <p>It implies the Earth's location played a role in the Moon's terrain formation</p> Signup and view all the answers

    What is true about the names of the Moon's significant surface features?

    <p>They have fanciful Latin names</p> Signup and view all the answers

    What is the primary reason for the difference in cratering between the lunar highlands and maria?

    <p>Sudden drop in meteoritic bombardment around 3.9 billion years ago</p> Signup and view all the answers

    What is the primary difference in composition between the lunar highlands and maria?

    <p>The highlands are richer in aluminum, while the maria are richer in iron</p> Signup and view all the answers

    What is the approximate density of the rocks found in the lunar highlands?

    <p>2900 kg/m3</p> Signup and view all the answers

    What is believed to have occurred on the Moon around 3.9 billion years ago?

    <p>A sudden sharp drop in meteoritic bombardment occurred</p> Signup and view all the answers

    What process is believed to have formed the type of rock found in the maria?

    <p>Upwelling of molten material through the lunar crust</p> Signup and view all the answers

    What do many of the rock samples brought back by the Apollo astronauts show evidence of?

    <p>Repeated shattering and melting</p> Signup and view all the answers

    What is the name of the system of valleys at the edge of the Mare Imbrium?

    <p>Hadley Rille</p> Signup and view all the answers

    What is the average density of the Moon?

    <p>3300 kg/m^3</p> Signup and view all the answers

    What is the probable reason for the absence of a lunar magnetic field?

    <p>The absence of a liquid core and the Moon's slow rotation</p> Signup and view all the answers

    What is the size of the large crater closest to the center, Autolycus?

    <p>40 km</p> Signup and view all the answers

    How high does Mount Hadley rise?

    <p>5 km</p> Signup and view all the answers

    What is the estimated radius of the Moon's core?

    <p>200 km</p> Signup and view all the answers

    What is the primary reason for the crust becoming thinner on the near side and thicker on the far side of the Moon?

    <p>The denser lunar mantle sank below the lighter crust in Earth's gravitational field</p> Signup and view all the answers

    What is the age of the oldest rocks discovered in the lunar highlands?

    <p>4.4 billion years</p> Signup and view all the answers

    What happened to the surface layers of the Moon during the first half billion years of its existence?

    <p>They were heated and remelted to a depth of 400 km</p> Signup and view all the answers

    What is the result of the denser lunar mantle sinking below the lighter crust?

    <p>The crust and mantle became slightly off-center</p> Signup and view all the answers

    What formed on the surface of the Moon about 3 billion years ago, filling the low-lying impact basins?

    <p>Molten lava</p> Signup and view all the answers

    What is a characteristic of the Moon at the time of its formation?

    <p>It was already depleted in heavy metals</p> Signup and view all the answers

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