Listen to part of a lecture in an Astronomy Class.
- What is the main purpose of the lecture?
- A. To explain why scientists disagree about the age of the Moon.
- B. To present arguments in favor of another Moon landing.
- C. To explain how scientists discovered a crater on the far side of the Moon.
- D. To review some finding of a recent mission to the Moon.
- What does the professor imply about the spacecraft Clementine?
- A. It sent back the first color photographs of the Moon.
- B. It was powered by solar energy.
- C. It landed in the far side of the Moon.
- D. It flew over the Moon’s polar regions.
- Why does the professor mention the Moon’s mantle?
- A. To explain why scientists believe that meteor impacts cannot affect the Moon’s mantle.
- B. To explain what kind of information scientists hope to obtain from the mantle.
- C. To point out that the Moon’s crust and mantle are made of similar materials.
- D. To point out that the Moon’s mantle and Earth’s mantle have different compositions.
- Why is the South Pole-Aitken Basin thought to be exceptionally old?
- A. The walls of the Basin are more reflective than those of most other craters.
- B. Testing of rocks from the Basin’s floor proves them to be as old as the Moon itself.
- C. Many small craters have been detected at the bottom of the Basin.
- D. A large amount of dust has been detected in and around the Basin.
- Why does the professor consider it important to find out if water ice exists on the Moon?
[CHOOSE 2 ANSWERS]
- A. Water ice could be processed to provide breathable air for astronauts.
- B. One component of water ice could be used as a fuel for rockets.
- C. Water ice could contain evidence of primitive life on the Moon.
- D. Water ice could be tested to find out what type of meteors crashed into the Moon.
- What does the professor imply when he says this: 🎧
- A. The current age estimates for the South Pole-Aitken Basin are based on incorrect assumptions.
- B. The technology to analyze Moon rocks has not advanced much since the days of the Moon landings
- C. Too few of the original Moon-rock samples were dated accurately
- D. Only by testing samples from South Pole-Aitken Basin can its age be precisely determined
B D B C AB D