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Chapter 18 Vocab
Term | Definition |
---|---|
Volcanism | describes all the processes associated |
hot spot | are unusually hot regions of Earth's mantle where high temperature plumes of magma rises |
flood basalt | form when lca flows out of long cracks in earth crust. |
fissure | cracks |
conduit | lava reaches the surface by traveling through a tube-like structure |
vent | emerges through an opening |
crater | at the top of a volcano around the vent is a bowl shaped depression. |
caldera | can be the magma chamber beneath a volcano empties is a form a major eruption |
shield volcano | is a mountain with broad gently sloping sides and a nearly circular base. |
cinder cone | when eruptions eject small pieces of magma into the air |
composite volcano | are formed of layers of hardened chunks of lava from violent erutions alternating layers of lava that oozed downsloped |