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lava ripples in old lava flow

Lava ripples are clearly visible on this ancient block of lava, in the Lava Beds National Monument (California).­

For more info about this place, read en.­wikipedia.­org/­wiki/­Lava_­Beds_­National_­Monument.

Unnamed Road, Tulelake, CA 96134, USA

Lava beds and geothermal features in the Pacific North-West.­