On Earth, shifts in our climate have caused glaciers to advance and recede throughout our geological history (known as glacial and inter-glacial periods).
is"a large, perennial accumulation of crystalline ice, snow, rock, sediment, and often liquid water that originates on land and moves downslope under the influence of its own weight and gravity."
The absence of these U-shaped valleys means that ice sheets on Mars likely moved and eroded the ground under them at extremely slow rates compared to what occurs on Earth. To determine if Mars experienced glacial activity in the past, Grau Galofre and her colleagues modeled the dynamics of two ice sheets on Earth and Mars that had the same thickness, temperature, and subglacial water availability.
These findings demonstrate how glacial ice on Mars would drain meltwater much more efficiently than glaciers on Earth. This would largely prevent lubrication at the base of the ice sheets, which would lead to faster sliding rates and enhanced glacial-driven erosion.
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