Scientists Have Now Examined Rocks That Came from Mars in Their

question 220

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 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.

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