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Geologist Susan Humphris uses a hand lens to look at a rock dredged from a young volcano. The rock’s glassy surface formed when the hot lava was rapidly quenched by cold seawater.


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Geologist Susan Humphris uses a hand lens to look at a rock dredged from a young volcano. The rock’s glassy surface formed when the hot lava was rapidly quenched by cold seawater.

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