Intrusive extrusive
Volcanoes By Camilla and Megan. Volcanoes Volcanoes are formed when there is a weak spot in the crust, and magma comes to the surface. It is formed at.
Bellringer
IGNEOUS ROCKS
Bellringer Describe the relationship between the silica content of magma and the resulting eruption of the volcano.
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Volcanoes
Geologic History Very Brief Version
