Assertion: erosion | /r/HasProperty | responsible for river drainage channels
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Source sentences:
text: Erosion by liquid water on Mars in the past is responsible for river drainage channels but the sublimation of carbon dioxide on the walls of impact craters seems to cause rock and soil to flow downhill to make the gullies seen on crater walls as illustrated by this particularly sharp image taken of the side of Newton Crater by the Mars Global Surveyor.