有证据表明，这一时期发生了重大的生态和地质变化。
There is evidence of major ecological and geological changes during this period.
Hansen-Koharcheck说：“观看现今火星上活跃的地质变化过程是一件很酷的事情。”
"To see an active geologic process on Mars today is cool, " said Hansen-Koharcheck.
Hansen-Koharcheck说：“观看现今火星上活跃的地质变化过程是一件很酷的事情。”
"To see an active geologic process on Mars today is cool, " said Hansen-Koharcheck.
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