Yellowstone

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Lichen - Pronunciation Key - [lahy-kuhn] noun 1. any complex organism of the group Lichenes, composed of a fungus in symbiotic union with an alga and having a greenish, gray, yellow, brown, or blackish thallus that grows in leaflike, crustlike, or branching forms on rocks, trees, etc. 2. Pathology. any of various eruptive skin diseases. ?verb (used with object) 3. to cover with or as if with lichens. [Origin: 1595?1605; Gk leichn] (Dictionary.com)

A rather round formation.

A brave squirrel at Old Faithful that doesn't back away from humans quickly. Looks as though it is sharpening its teeth.

Steaming old faithful, a short time before its eruption.

Old Faithful erupts on scedule.