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14.7 ± 1.2 ka, signaling retreat of the Purcell Trench lobe from the Clark Fork valley, yet these floods entered a glacial Lake Columbia still impounded by the Okanogan lobe.Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94550, USA, and Department of Earth Science, University of California, Riverside, California 92521, USAMoraine successions in glaciated valleys south of Mount Everest provide evidence for at least eight glacial advances during the late Quaternary. In air it is coated by uranium oxide, tarnishing rapidly. Uranium can form solids solutions and intermetallic compounds with many of the metals.Depleted uranium is used as shelding to protect tanks, and also in bullets and missiles.

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The Martian atmosphere in contrast contains 1.6% of Ar-40 and 5 ppm Ar-36.World production exceeds 750.000 tonnes per year, the supply is virtually inexhaustible.Argon does not react with the filament in a lightbulb even under high temperatures, so is used in lighting and in other cases where diatomic nitrogen is an unsuitable (semi-)inert gas.This provides an ideal method for determining when a glacier retreated from a region, hence exposing the ground beneath.Technological developments in the last few decades have allowed more precise measurements of their concentration in terrestrial rock samples and this dating technique is becoming increasingly popular.

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