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So then you'd be more interested in the earth's layers, what the glacier's dropped off where, that sort of thing? Through my 6th grader we learned all about NJ's makeup last year. Actually, it was pretty interesting stuff.
Pahoehoe is smoother ropy folds of lava.
Ah-ah is rougher to the touch and I guess the early Hawaiians used to say "ah-ah" when they stepped on it so that's what they called it. (At least that's the only way I can remember it).
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