Lichen-Covered Basalt Cliff in Cowiche Canyon
Ancient basalt columns are a typical sight in Central Washington. They are formed by cooling lava, forming cracks that create these columns by contracting. The faster the lava cools, the thinner the columns. These thick columns cooled gradually over some time. The presence of the lichens that now cover the stony face is an indicator of very good air quality and a lack of pollution.
- © 2014
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