This image shows a portion of Lethe Vallis, an outflow channel that also transported lava. This is one of only a few places on Mars where these pristine-appearing landforms have been identified. The channel formed by catastrophic floods, during which it produced the prominent crater-cored, teardrop-shaped island in the middle. via NASA http://www.nasa.gov/image-feature/a-streamlined-form-in-lethe-vallis-mars
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