-Volcanoes are not evenly distributed throughout the world; only concentrated along the ridges or trenches.

-The highest concentration lies along the west coast of the Americas.

- The plate that is going under another plate will have its rock melted by the heat of the Earth only to come up again in the form of lava to build up another volcano.

-The two main types of volcanoes are Composite and Shield.

- Composite Volcanoes

These volcanoes usually occur at a convergent plate boundarys. They are most likely shaped in a very tall cone because of their explosive style. The debris going straight into the air and then coming right back down. The magma that comes from the volcanoes tends to be high in viscosity due to its low temperature and high composition levels of silica and gases.

- Shield Volcanoes

These volcanoes tend to be closely the exact oppositeof the above mentioned volcanoes. They usually occur at divergent plate boundaries. Shield volcanoes have a very wide surrounding basin from the central point of lava flow due to the low viscosity of their lava. Also these volcanoes have lava with high temperatures and low concentrations of silica and gases.
 
 

For more information about volcanoes visit the Volcano World page.
 
 

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