The bulk of Vulcanian deposits are fine grained ash.
大部分火山岩矿床为细粒灰岩。
Deposits of volcanic ash colour this view of the Meridiani Planum, as seen by the Mars Express High Resolution Stereo Camera.
颜色的火山灰沉积这个子午线平原认为，正如火星快车高分辨率立体照相机看到。
Deposits of volcanic ash colour this view of the Meridiani Planum, as seen by the Mars Express High Resolution Stereo Camera.
颜色的火山灰沉积这个子午线平原认为，正如火星快车高分辨率立体照相机看到。
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