Volcanoes I. Where volcanoes happen A. Mid Ocean Ridges

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2. Acidic

-Sticky explosive lava with a silica content of 70% or more.

-Traps gases within it so volcanoes are more explosive.

-creates dome shaped volcanoes (narrow base and high steep sides).

-happens at destructive plate boundaries at subduction zones.

-Example is Mount St. Helens in the USA

B. Pyroclasts

-also known as volcanic bombs

-hot ash, lava and pieces of rock that are thrown out of a volcano.

-Pyroclastic flows are boiling clouds of ash and rock which move quickly and destroy everything in their path.

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