Lesson 4volcanoes & different volcanic activities

Turn your book on page 335!!!!!!

Volcano

• Is an opening in the earth’s crust where lava, pyroclasts, and gases are ejected onto the surface during eruptions.

• Calderas – that exceed about 1 km in diameter• formed when the summit of volcano collapses during

eruptions.

Kinds of volcano

•Shield volcano•Cinder cone volcano•Composite volcano or stratovolcano

Shield volcano

The largest shield volcano

Cinder cone volcano• Is built almost entirely of loose

fragments called CINDERS

Composite volcano

According to activity• Active• Dormant• Extinct

Volcanic eruptions• Explosive or violent eruption• Quiet or non – explosive eruption

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