'Knobby terrain' a sign of Mars's explosive past

Wednesday, January 28, 2015 - 10:30 in Earth & Climate

The Red Planet's upper crust is brittle and weak. Planetary geologists often attribute this to effusive eruption -- lava pouring out of a volcano onto the ground -- early in Mars's history with later modifications. However, some have suggested that the friable materials were created by widespread ash-laden explosive volcanoes that were eroded by geologic processes over the course of Martian history.

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