Why do planetary scientists believe the SNC meteorites came from Mars?
A) They were brought back by the return voyage of the Mars Pathfinder mission.
B) Their fall to Earth was tracked by radar, so it was possible to reconstruct their trajectories.
C) Radioactive minerals in the rocks allows them to be dated from approximately the same time as similar layers on Mars.
D) Their chemistries are similar to rocks from Mars's surface, and they contain trace gases that match Martian atmospheric samples.
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