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火山！

Volcano

火山

 

A volcano is a mountain that forms when magma reaches the surface of the Earth.

Magma rises because it is less dense than the solid rock around it.

Cinder Cone Volcano

锥形火山

  • Has tall, very steep sides.

  • Has explosive eruptions.

  • This eruption produces a lot of cinder and ash.

Shield Volcano

盾形火山

•Is wide and somewhat flat.

•It forms from a quiet eruption.

Lava flows out quietly and for great distances.

Composite Volcano

复合式火山

  • Form from explosive eruptions.

  • Produce a lot of lava and ash.

  • Is small, with steep sides.

Crater

火山口

  • the top of the volcano.  It is a funnel shaped pit.  It is formed when the material explodes out of the vent!

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