Radiocarbon dating easy explanation

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ICEsat satellite observations of subglacial lakes has shown that the ice surface above subglacial lakes is constantly changing, suggesting that water is flowing between lakes[5,8].

These lakes, identified in regions of ice-stream onset zones, and characterised by changes in elevation, are considered active, whilst the lakes identified by RES under thicker ice under Dome C, for example, are considered inactive[5].

This radio wave is then received by the aeroplane, and yields ice-thickness data to within 1.5% accuracy[2].

This lake has between 37 m of ice above it[4, 7], and is 14,000 km in area[2].The location of subglacial lakes is important, because the presence of meltwater and saturated subglacial sediments facilitates rapid ice velocity (see Ice streams).Water-saturated sediments reduce basal shear stress, allowing basal sliding at low driving stresses[6, 9].It lies within a subglacial topographic basin, similar to a rift valley[4].It is at least 1000 m deep in the south, but relatively shallow in its northern and southwest corners. NASA’s repeat-track uses laser altimeter data to measure height changes at a high resolution.

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