Did Water or Lava Carve the Outflow Channels on Mars?

Universe Today Thursday 29th March, 2012

Outflow channel in the Tharsis region on Mars. Credit: NASA/JPL/University of Arizona Large features on Mars called outflow channels have been a point of contention among planetary scientists. "Most Mars scientists accept that outflow channels were carved by water, but alternate hypotheses persist, especially that lava carved the outflow channels,"...

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