Kasei Valles is the largest channel carved by water on Mars. And along its course, it contains the biggest dry waterfalls known anywhere.
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Ravi Vallis is one of the shortest, yet most dramatic of Martian outflow channels.
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Perhaps because it's among the oldest Mars volcanos known, Tyrrhena Mons appears unlike most others on the Red Planet.
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In Memnonia Sulci, the wind has carved long ridges in one of Mars' most enigmatic geologic units.
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A thick stack of sediments awaits scientists in Gale Crater.
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This Martian valley was eroded from below, as lava melted subsurface ice.
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Windows into the Martian past appear as erosion strips away layer after layer.
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Hills and mesas in Cydonia are covered with material that's likely rich in ice.
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Petals of rocky debris encircle a fresh crater, telling of impacts and blast waves.
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A meteorite impact on the canyon rim probably set off a giant landslide.
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All the geological signs point to a brief, but highly violent flood.
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Clay sediments have made Mawrth a top candidate site for NASA's next rover.
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Spectacular scenery lies everywhere in Melas Chasma, because it's part of the great Valles Marineris rift.
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Young lava plains meet an ancient landscape where they engulf Terra Sirenum's borders.
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A ruined crater at the highlands' edge may be a place to look for life.
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When technology permits a visit with a rover, Candor will be high on the must-see list.
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Most Martian lava is basalt, like Hawaii. But Nili's lava picture isn't so simple.
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A big mesa fills much of Hebes, and scientists want to know how it formed.
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Wind erosion, lava flows, and impacts have shaped the face of Arabia Terra.
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Billions of years of deposition and erosion have scrawled a complex story on a large crater's smooth floor.
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This small basin in Valles Marineris likely holds sediments that could preserve traces of early Martian life.
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Layers of gypsum in Juventae Chasma recall a water-rich era that may have seen life, too.
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Clay sediments in the hills nearby point to ancient wet environments.
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Sediment layers going back at least 3 billion years in Martian history make a record book waiting to be opened.
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Its mesas were born long ago when groundwater suddenly escaped.
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A long climate history lies in north polar cap's layers of dust and sand.
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Craters of widely different ages have left their mark on the channel's teardrop islands.
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Thick sediments in an ancient crater hint at a long, complex geological history.
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Floodwaters breached Holden's walls and left heaps of sediments inside.
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NASA may send its next rover here to probe the sediments left by an ancient river.
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Ice and debris from countless climatic cycles have all but buried a polar crater.
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As subsurface water escaped in Coprates, the ground opened in pits and valleys.
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Impacts, floods, and tectonic forces have left scars on this outflow channel.
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A deep canyon in the polar cap reveals emerging ancient deposits.
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