A stream of liquid lava flows from the lava lake at Mount Nyiragongo, Democratic Republic of Congo. A lava lake forms as magma from deep in the Earth wells up and collects in a crater or vent.

Photograph by Chris Johns
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Plate Tectonics and Volcanic Activity
Plate Tectonics and Volcanic Activity Article

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5 - 12

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Earth Science, Geography

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A volcano is a feature in Earth's crust where molten rock is squeezed out onto the Earth's surface. Along with molten rock, volcanoes also release gases, ash, and solid rock.

stream
stream Encyclopedic Entry

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5 - 12 and up

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Physics, Geography

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A stream is any body of flowing fluid. The most familiar type of stream is made of water, although streams can also be made of air, lava, electricity, or any other fluid.