Multiple Choice
Scientists have now examined rocks that came from Mars in their laboratories on Earth because:
A) an orbiting spacecraft scooped up Martian dust during its passage by Mars and then returned to Earth.
B) several meteorites found in Antarctica are now thought to have been knocked off Mars and fallen to Earth.
C) spacecraft have been to the surface of Mars and have returned with samples of Martian rocks and soil.
D) a large impact that occurred on the Martian surface early in its history created a vast dust cloud through which Earth passes once per year, and samples of this dust have now been collected by the Space Shuttle.
Correct Answer:

Verified
Correct Answer:
Verified
Q26: Why does the ejecta blanket around some
Q151: What is the MOST likely cause of
Q160: What fraction of the total mass of
Q205: How is water ice able to remain
Q258: What caused the long, meandering scarps (cliffs)
Q571: Viewed from a position above the north
Q576: The density of Mercury is about the
Q577: Which statement about the similarities of Mercury
Q578: The origin of the Martian magnetic field
Q579: Venus possesses all of the following EXCEPT