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= __VOLCANOES & THE ROCK CYCLE__ =

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= = There are three types of volcanoes:
 * Cinder Cone Volcanoes
 * Shield Volcanoes
 * Composite Volcanoes

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 * Cinder Cone Volcanoes: A cone structure built by an accumulation of loose bits of magma called scoria. That fall around a vent or crater after being expelled during moderately explosive activity.They are the simplest of volcano structures and are prevalent in Western North America and elsewhere in the world.

> The shape of this type of volcano is more like a dome than a tall cone. This type of volcano is built slowly and can have multiple vents producing lava flows.
 * Sheild Volcanose: A large volcanic structure with long gentle slopes built up almost entirely from fluid lava flows.

> It is a cone shaped mountain with steep, smooth, barren slopes often with a single plume of smoke emitted from a single central vent. It is composed of alternating layers or strata of material created by pyroclastic (lava) flows. Liquid magma is emitted from a reservoir deep in the earth's crust. > >
 * Composite Volcanoes: These types of volcanoes are also known as a strato volcano. This is the type of volcano most commonly imagined.

Krakatau is a historical volcano that is located in Indonesia. It erupted in 1883.





The rock cycle is: A fundamental concept in geology that describes the dynamic transitions through time among the three main rock types: sedimentary, metamorphic, and igneous. As the diagram to the top of this shows each type of rock is altered or destroyed when it is forced out of its equilibrium conditions. The rock cycle is an picture that explains how the three rock types are related to each other, and how processes change from one type to another over time.

The rock cycle is related to volcanoes because volcanoes are where all rocks start. Rocks always start in the magma chambers depending on the type of rock igneous, metamorphic,and sedimentary.

This the rock cycle:

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This is a volcano erupting:

media type="youtube" key="tGPD_0SCDp4" width="425" height="350"

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Our sources were:
 * Geology.com
 * USGS
 * Thinkquest.org
 * youtube
 * our books