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Lava
Lava is the word for
magma when it erupts
onto the Earth's surface. Geologists also use the term to describe
the solidified deposits of lava flows and fragments hurled into the
air by explosive eruptions (for example, lava bombs or blocks). Lava
is from the Italian word for stream, which is derived from the verb
lavare—to wash.
Left: A fast-moving lava flow from Mt. Etna in Sicily. Lava
flows can also move slowly, especially as they begin to cool and
develop a hard crust.
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