Weak spot in the crust where molten material or magma comes to surface~Volcano
A molten mixture of rock forming substances, gases and water from the mantle~Magma
Magma that comes to earths surface~Lava
Major volcanic belt that is formed by the many volcanoes that rim the pacific ocean~Ring of fire
A string of islands formed by volcanoes created by spreading boundaries~Island arc
An area where material from deep within the mantle melts forming magma which erupts through the crust to form a volcano~Hot spot
A pocket where magma collects in a volcano~Magma chamber
Long tube in volcanos which connects the magma chamber to the earths surface~Pipe
An opening where molten rock and gas leave the volcano~Vent
Area covered with lava as it pours out the volcanoes vent~Lava flow
A bowl-shaped area that forms around a volcano’s central opening~Crater
A material found in lava, formed from the elements oxygen and silicon~Silica
Thin, quick flowing lava~Pahoehoe
A hot explosive eruption of ash, cinders, bombs and gases~Pyroclastic flow
A steep, cone-shaped hill or small mountain made of ash, cinders, and bombs piled up around a volcano’s opening~Cinder cone volcano
A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions~Shield volcano
A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials~Composite volcano
Magma that forces itself across rock layers~Dike
When magma squeezes itself through horizontal layers of rock~Sill
Magma hardens in a volcano’s pipe after an eruption~Volcanic neck
Formed when magma hardens underground; dikes, sills and volcanic necks~Igneous Intrusions

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