Documents Volcanic Activity What caused Mt. St. Helens to erupt?

Slide 1Volcanic Activity What caused Mt. St. Helens to erupt? Slide 2 Where do Volcanoes Occur? Slide 3 Where do volcanoes occur? Along convergent boundaries above subduction…

Documents How do volcanoes form and what affect do they have on the Earth?

Slide 1 How do volcanoes form and what affect do they have on the Earth? Slide 2  Along convergent boundaries:  Above subduction zones  Magma forced upwards and…