What is this close-up picture? (WotsThat: Lichen on granite)

Question

What object is shown in this zoomed-in close-up photo?

VexGarnet · Accepted Answer

Lichen on granite. Lichens are actually slowly dissolving granite at a molecular level by secreting acids that break down feldspar, one of the rock's main components, which means those colorful crusty patches are essentially the world's slowest demolition crew, weathering away mountains grain by grain over centuries. Some scientists think this ancient lichen-granite partnership might have even played a role in creating soil on early Earth, giving plants their first foothold on barren rock.

Answer: Lichen on granite

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