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Science Chapter 9 Vocab
Earth Science Book Chapter 9 Vocab
15
Science
7th Grade
05/04/2009

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Term
Aa
Definition
a solidified basaltic lava flow on land that has formed with rough, jagged surfaces
Term
Caldera
Definition
a large, crater-shaped basin formed after the top of a volcano collapses
Term
Cinder Cone
Definition
a cone-shaped volcano formed from lava fragments that have been ejected from a volcanic vent
Term
Composite Volcanoes
Definition
a volcano made of layers of hardened lava flows and pyroclastic materials
Term
Hot Spot
Definition
an area of volcanic activity that results from a plume of hot solid material that has risen from deep within Earth's mantle.
Term
Lahar
Definition
a fast-moving mud-flow that occurs when the heat associated with a volcanic eruption melts snow and ice on top of a volcano
Term
Lava
Definition
magma that reaches Earth's surface
Term
Lava Plateau
Definition
A plateau formed from basaltic lava pouring from a crack or rift in Earth's surface
Term
Pahoehoe
Definition
solidified basaltic lava flow on land that has formed with smooth, rope-like surfaces
Term
Pillow Lava
Definition
lava that cools underwater, taking on a distinctive pillow-like shape as it hardens
Term
Pyroclastic Flow
Definition
a dense superheated cloud of gases and pyroclastic materials that moves rapidly downhill from an erupting volcano
Term
Pyroclastic Material
Definition
solid rock fragments that are ejected during a volcanic eruption
Term
Shield Volcano
Definition
A shield shaped volcano with a brood base and gently sloping sides that is made of basaltic lava
Term
Viscosity
Definition
a substance's resistance to flow
Term
Volcano
Definition
an opening in Earth's crust through that molten rock,gases, and ash erupt; also the landform that develops around this opening
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