lavaLava is molten rock. It usually comes out of erupting volcanoes.
lava bombA volcanic bomb is a chunk of viscous lava (over 64 mm) that is ejected (thrown) from a volcano. Since they are still viscous when ejected, they often have rounded, aerodynamic shapes. Type of bombs include: breadcrust bombs, ribbon bombs, spindle bombs, spheroidal bombs, and "cow-dung" bombs.
lava domeA lava dome is a dome-shaped mound that is formed around a vent by viscous lava.
lava tubeA lava tube is a tube-like, underground conduit formed by flowing lava. The flowing lava crusts over at the edges and drains out onto lower ground - what is left is a smooth, tube-like tunnel with hanging lava stalactites and a flat floor - a lava tube.
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