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Chapter 13

Volcano Science Vocab

QuestionAnswer
Define volcanism. any activity that includes the movement of magma towards or onto Earth's surface
Name at least two tectonic settings which are major volcanic zones. boundaries of tectonic plates, mid-ocean ridges, subduction zones
What forms when oceanic lithosphere subducts beneath oceanic lithosphere? a island arc
What island is cut by a fissure breaking it into two parts? Iceland
Describe a hot spot. a volcanically active area of Earth's surface, commonly far from a tectonic plate boundary
Describe a quiet eruption. produced by mafic lava, a runny lava with low viscosity and few trapped gases
Describe an explosive eruption. produced by felsic magma, a sticky lava with high viscosity and a high amount of trapped gases
What type of eruption was the Mount St. Helens? explosive
Define pyroclastic material. fragments of rock that form during a volcanic eruption
List 5 types of pyroclastic material. volcanic ash, dust, blocks, bombs, and lapilli
Created by: Amatulli Science
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