VOLCANOES

MOUNT ST HELENS

• Last erupted in July 10, 2008
• In skamania county, Washington

MOUNT PINATUBO

• Last erupted in 1991
• Located in the Cabusilan mountains

CAUSES OF VOLCANOES

• Volcanic activity frequently occurs at the boundaries of the Earth's
• tectonic plates which are a series of large blocks moving between each
• other.

MAGMA

• Magma is deep underground, in chambers beneath volcanoes

LAVA

• Lava is the stuff that comes out of volcanoes.

REQUIREMENTS

• Active- at least one eruption in10,000 years
• Extinct- has not had an eruption in 10,000 years

EFFECTS

• Keeps the earth cool by removing
• Heat from the interior
• Volcanoes are proof that the
• Earth is living and ever changing
• It destroys everything in its path