Objective: SWBAT identify and describe factors effecting volcano

production IOT differentiate amongst 3 types of volcanoes

Drill: Where are three areas you would expect to find volcanoes on

the earths surface?

Volcanoes refer to areas in the Earths crust that release gasses, molten rock,

or ash.

MELIPEUCO, Chile, July 13 2008

Alaska’s Aleutian Islands May 23,2006 Yellowstone National Park

Hot spring

From our definition of volcano we can reason that they would be found along plate boundaries and over hotspots where the inner earth is exposed to the Earths surface.

Volcanoes are classified by how they are formed. There are 5 main types.

• Shield Volcanoes• Cinder Volcanoes• Composite Volcanoes• Calderas• Lava Plateau

Shield Volcanoes• Characterized by having broad

based and gently sloping sides.• Caused by the flow of low

viscosity Mafic magma– Since the magma is thin,

gasses can readily escape and eruptions are not explosive

• Extrude basaltic lava• Because of the broad base, these

volcanoes can grow to be very high

12,188.3 feet

Types of lava

Cinder Cones• Characterized by a cone

shaped mound with a oval base

• Caused by lava fragments that explode outward and harden before they hit the ground

• Relatively small • Generally form in groups

or on the sides of larger volcanoes

• Slope of these volcanoes are usually steep

Composite Volcanoes

-Composed of alternating layers of rock fragments, ash, and lava.

Cycling quiet lava flows interrupted by explosive eruptions of pyroclastic material

-Are large volcanoes

Also known as Strato-volcanoes