Volcanoes. 3 Types of Volcanoes 1) Shield 2) Cinder Cone 3) Composite.

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Presentation transcript:

Volcanoes

3 Types of Volcanoes 1) Shield 2) Cinder Cone 3) Composite

Shield Volcanoes Look like a warrior’s shield Look like a warrior’s shield Broad-slightly dome shaped volcanoes are the world’s largest Broad-slightly dome shaped volcanoes are the world’s largest Generally have lava that flows easily and can spread over great distances, building up in layers that form a low, wide mountain. Generally have lava that flows easily and can spread over great distances, building up in layers that form a low, wide mountain.

Shield Volcano

Cinder Cone Built up from ashes, rock, and cinders from violent eruptions Built up from ashes, rock, and cinders from violent eruptions The rocks fall back down to Earth near the opening, forming a cone The rocks fall back down to Earth near the opening, forming a cone Occur near the sides of composite and shield volcanoes Occur near the sides of composite and shield volcanoes Erupt over a short period of time, so most are not over 300m (1000 feet) high Erupt over a short period of time, so most are not over 300m (1000 feet) high

Cinder Cone

Composite Volcano Switches between quiet eruptions of flowing lava and violent eruptions of thick, gas rich lava. Switches between quiet eruptions of flowing lava and violent eruptions of thick, gas rich lava. Has the most powerful eruptions Has the most powerful eruptions Generally taller than Cinder Cone volcanoes Generally taller than Cinder Cone volcanoes

Other Types of Volcanic Activity Hot springs – forms when ground water heated by a nearby pool of magma rises to the surface and collects in a natural pool Hot springs – forms when ground water heated by a nearby pool of magma rises to the surface and collects in a natural pool Geyser – a fountain of superheated water and gas that shoots up from the ground Geyser – a fountain of superheated water and gas that shoots up from the ground

3 Phases of a Volcano Life Cycle 1) Active – currently erupting 2) Dormant (Sleeping) – not actively erupting, but will in the future 3) Extinct (Dead) – not likely to erupt in the future