How magma forms 1. Temperature 2. Pressure 3. Addition of fluids.

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Presentation transcript:

How magma forms 1. Temperature 2. Pressure 3. Addition of fluids

Lava Flows Pahoehoe – hot fluid lava Aa – forms sharp rock Least viscous Aa – forms sharp rock Blocky – chunky rock Most viscous

Types of Volcanoes Cinder Cone – explosive eruptions Tall and pointy

Calderas Circular depression that forms when magma chamber below empties

The Ring of Fire Area of most active volcanoes Area along the Pacific Ocean

Hot Spots Area where lava comes through the crust as plates pass overtop Away from plate boundaries

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