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Monday, October 31, 2005


IMPORTANT - GEOG HOMEWORK
Slide 1 - Tile Page….What Are Volcanoes and When do They Occur?

Slide 2 - Key Words. Dormant: A volcano that has not erupted in some time but may do in the future. Extinct: A volcano that scientists have predicted won’t erupt again. This is hard to tell and not always right. Active: A volcano that has recently erupted recently and will continue as far as scientists can tell.

Slide 3 - Examples, Dormant = Soufriere Hills volcano, Montserrat (image) Extinct = Mount Vesuvius, Pompeii (image) Active = Mount Fuji, Honshu, Japan (image)

Slide 4 - Where Are Volcanoes Found? Most volcanoes are found along the edges of the Earth’s tectonic plates. (image) For example, ‘The Ring of Fire’ which runs along the west side of America, through the Pacific Ocean, along New Zealand and along the East of Asia. (image)

Slide 5 - Why Do They Occur? The ways in which tectonic plates move can create different types of volcanoes. Bullet pointed phrases. Destructive: Oceanic plates that push into each other and create pressure in doing so. These are fairly common.
Constructive: The plates move out and the pressure from the magma and gases beneath the crust comes out of the gap.
Passive: When two plates push past each other and break the crust causing the pressure to get through slowly until it gets too much and erupts.

Slide 6 - Types of Volcanoes. Key words style. Shield Volcanoes = Formed when lava sets and creates a dome shape. Examples of these can be found in Hawaii and Mauna Loa. Cone Volcanoes = Where smaller rocks and ash pile up around the top of the volcano. Stratovolcanoes = Very high mountain shaped volcanoes that eject material and have lava flows. Examples of this are Mount Fuji and Mount Mayon. Super volcanoes = Particularly large volcanoes that will cause continental devastation and affect global weather when they erupt. Like Yellowstone National Park for example. Sub-marine Volcanoes = They can be found in shallow and deep waters. The shallow ones usually produce steam and gases.
(images of some of the types)

Slide 7 - Main Features of a Volcano. (Annotated diagram) Main vent - the material such as magma flows up here. ….Layers - lava and ash that has solidified on the side of the volcano. …..Magma chamber - molten rock and lava wells up from beneath the earth’s crust. …..Crater - the funnel shape at the top of the volcano, material from the main vent shoots out here.

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