Sentences with phrase «glacial deposits on»
When NASA's Mars Global Surveyor observed further evidence for ancient glacial deposits on Mars after it arrived in 1997, the idea became less outlandish.
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The movement of these large masses of ice also leaves distinct marks on the walls of valleys and in the form of deposits of glacial sediment.
Here we show that the East Greenland Ice Sheet existed over the past 7.5 million years, as indicated by beryllium and aluminum isotopes (10Be and 26Al) in quartz sand removed by deep, ongoing glacial erosion on land and deposited offshore in the marine sedimentary record.
Soot absorbs incoming solar radiation and can speed glacial melting when deposited on snow in sufficient quantities.
Yellowstone's northern range of sagebrush - grasslands and bison, elk, wolf, and bear inhabitants is founded on glacial moraines, sub-glacial till, and outwash deposited during the last glaciation.
The continental glaciations of the Pleistocene left signatures on the landscape in the form of glacial deposits and landforms; however, the best knowledge of the magnitude and timing of the various glacial and interglacial periods comes from oxygen isotope records in ocean sediments.