26 terms

Earth's Structure: Volcanoes

Lesson 1 - Volcanoes and Plate Tectonics Lesson 2 - Volcanic Eruptions Lesson 3 - Volcanic Landforms
Earth's rocky outer layer
one of the large pieces that Earth's crust is broken into
the line along which something ends
a mountain that forms in Earth's crust when magma reaches the surface
a molten mixture of rock-forming substances, gases, and water from the mantle
the term used for magma when it reaches Earth's surface
Ring of Fire
a major belt of volcanoes that rims the Pacific Ocean
island arc
a string of volcanic islands created along a converging boundary
hot spot
a concentration of heat in the mantle capable of producing magma, which rises to Earth's surface
magma chamber
the area beneath a volcano where magma accumulates
a long tube that extends from Earth's crust us through the top of the volcano, connecting the magma chamber to Earth's surface
any place where molten rock and gas leave a volcano
lava flow
the spread of lava as it pours out of a vent
a bowl-shaped area that may form at the top of a volcano around the central vent
a material found in magma that forms from oxygen and silicon
pyroclastic flow
the mixture of hot gases, ash, cinders, and bombs that flow down the sides of a volcano when it erupts explosively
sleeping; expected to awaken in the future and become active
dead; unlikely to ever erupt again
the hole left when a volcano collapses
cinder cone
volcanic material that has built up around a vent into a steep, cone-shaped hill or small mountain
composite volcano
tall, cone-shaped mountains in which layers of lava alternate with layers of ash
shield volcano
thin layers of lava pour out of a vent and harden on top of previous layers slowly building a wide, gently sloping mountain
volcanic neck
formed when magma hardens in a volcano's pipe and the surrounding rock later wears away
magma that forces itself across rock layers and then hardens
magma that squeezes between horizontal rock layers and then hardens
a mass of rock formed when a large body of magma cools inside the crust