Volcanoes occur when magma moves up to the surface (turning into lava).
Most volcanoes are located on convergent plate boundaries. There are 3 types of volcanoes, Shield, Composite and Cinder- Cone. Shield volcanoes have broad slopes and are less explosive than the other 2. Composite volcanoes are the ones generally though of. They are very violent and a real threat to people. Cinder- Cone volcanoes are smaller, but just as deadly as Composite volcanoes. They are explosive and can pose a threat. Iceland has recently had a volcanic problem. Eyjafjallajökull spewed tons of ash into the atmosphere. This caused many flights to be delayed. The ash in the air made it hard for people to breath and irritation in the eyes. |
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