Example: biology

Volcanoes!: Lesson 1 - USGS

LESSON 1 . magma is buoyant much like a cork in water; being buoyant, it rises. As the magma rises, some of it col-lects in large reservoirs, or magma cham-bers (poster fig. I) that fuel volcanoes. As the rising magma nears the Earth's sur-face, pressure decreases, which causes the gases in the magma to expand. This expansion propels the magma ...

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  Lesson, Volcanoes

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