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Glacial Valley, Andes Mountains
Credit & Copyright: Dr. Bruce G.
Also evident in this example are the high "cirque" headwalls of bare rock cliffs that once held the uppermost part of the glacier; and a typically oblong "tarn" lake that now holds the remnants of the glacial icemelt and now the rainwater and melted snowfall that still occurs in these elevations.
And obvious is the verdant green carpet of shrubs and small trees that have spread across the valley flow and walls. This is a classic example of "primary succession," when vegetation invades land laid bare and empty by such forces as glaciers, volcanoes, and other tectonic events.
Next week's picture: Red Hartebeest of the Savanna
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Bruce G. Marcot, Tom Bruce
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