Which of these upcoming observations will help test the idea that ...

[penza]

Which of these upcoming observations will help test the idea that Mars' atmosphere thinned due to interactions with the solar wind?
 
  A) Astronomers will use spectrographs on the Keck telescope to measure the density of Mars' atmosphere.
  B) The upcoming MAVEN orbiter will measure present-day gas loss from Mars' atmosphere.
  C) Geologists will measure the carbon content of Martian rocks that were transported to Earth by asteroid impacts.
  D) The Curiosity rover will measure the carbon content of rocks on Mars' surface.

Question 2

The footprints left on the moon by the Apollo astronauts will likely last for
 
  A) millions of years.
  B) no time; they were quickly erased by micrometeorites.
  C) the remaining existence of the Moon.
  D) a few decades.

[Fayaz00962]

Answer to Question 1

B

Answer to Question 2

A

[penza]

Thank you!

[Fayaz00962]

Always glad to help...