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ch.7 key terms

32 of them!

QuestionAnswer
a weak spot in the crust where magma has come to the surface volcano
the molten mixture of rock forming substances, gases, and water from the mantle magma
liquid magma that reaches the surface; also the rock formed when liquid lava hardens lava
a major belt of volcanoes that rims the Pacific Ocean Ring of Fire
a string of islands formed by the volcanoes along a deep ocean trench island arc
an area where magma from deep within the mantle melts through the crust above it hot spot
a substance in which all the atoms are the same that cannot be broken down into other substances element
a substance in which two or more elements are chemically joined compound
any characteristic of a substance that can be observed or measured without changing the composition of the substance physical property
any property of a substance that produces a change in the composition of matter chemical property
a liquid's resistance to flowing viscosity
a material found in magma that is formed from the elements oxygen and silicon silica
a hot, fast moving, type of lava that hardens to form smooth , ropelike coils pahoehoe
a slow moving type of lava that hardens to form rough chunks ;cooler than pahoehoe aa
the pocket beneath a volcano where magma collects magma chamber
a long tube which magma moves from the magma chamber to Earth's surface pipe
the opening in which molten rock and gas leave a volcano vent
the area covered by lava as it pours out of a volcanoes vent lava flow
a bowl shaped are that forms around a volcanoes central opening; a large round pit caused by the impact of a meteroid crater
the explusion of ash,cinders,bombs,and gasses during an explosive volcanic eruption pyroclastic flow
a volcano that is not currently active but that may become active in the future dormant
a volcano that is no longer active and is unlikely to errupt again; describes a type of organism that no longer exists anywhere on Earth extinct
a wide, gently sloping mountain made of layers of lava and formed by quiet eruptions shield volcano
a steep cone shaped hill or small mountain made of volcanic ash,cinders,and bombs piled up around a volcanoes opening cinder cone
a tall cone shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials composite volcano
the large hole at the top of a volcano formed when the roof of a volcanoes magma chamber collapses caldera
a deposit of hardened magma in a volcanos pipe volcanic neck
a slab of volcanic rock formed when magma forces itself across rock layers dike
a slab of volcanic rock formed when magma squeezes between layers of rock sill
a mass of rock formed whhen a large body of magma cools inside the crust batholith
the heating of uderground water by magama geotheral activity
a fountain of water and steam that builds up pressure underground and erupts at regular intervals geyser
Popular Earth Science sets

 

 



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