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Chapter 18

QuestionAnswer
volcanism describes all the processes associated with the discharge of magma, hot fluids, and gases.
hot spot unusually hot regions of Earth's mantle where high-temperature plus fo magma rise
flood basal form when lava flows out of long cracks in earth's crust
fissure are crakes
conduit lave reaches the surface by traveling through a tubelike structure
vent emerges through an opening
crater a bowl-shaped depresssion
caldera can be up to 50 km in diameter
shield volcano a mountain with broad, gently sloping sides and a nearly circular base
cinder cone form as this material called tephra, falls back to Earth and piles up around the vent
composite volcano formed of layers of harden chunks of lava from violent eruptions alternating with layers of lava that oozed down slope before solidifying
Created by: wtune
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