Lava, hot, molten rock that has erupted from a volcano or a crack in the Earth's surface. Before it reaches the surface, scientists call this liquid rock magma., Volcano, a geological vent or opening in the Earth's crust that allows molten rock, ash, and gases to escape from the planet's interior, Shizuoka , Japan, Where is Mount Fuji located?, Washington , USA, Where is Mount St. Helens located?

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