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#NationalIceCreamDay Igneous rocks form when molten material from the interior of the earth - comes to the surface - then cools and crystallizes, similar to how melted chocolate cools and hardens when you put it on cold ice cream. View Grand Canyon's igneous rocks - and more -… pic.twitter.com/KTNQbuIJ4d

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Grand Canyon NPS@GrandCanyonNPS

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