Volcanoes

Dormant

Active

Five Classifications of Volcanoes

•Stratovolcano•Cinder Cone•Shield Volcano•Caldera•Lava Dome

Stratovolcano•Also known as a composite cone•Built up from alternate layers of lava and ash•Form where you have ocean crust meetingcontinent crust (convergent zone).

Mount Fiji

Example:

Convergent Zone

Shield Volcano

•Broad, Shallow cone•Layers of lava•Hot spots have shield volcanoes

Example

Hawaiian Volcanoes

CINDER CONE

•Cone-shaped piles of tephra.•Throws out lava and ash into the air.•Divergent zones tend to have them in rift valleys( around stratovolcanoes).

Divergent Zone

Caldera•Usually collapes in on a stratovolcano or a hot spot.•Can be up to 62 miles wide.•An older volcano with a large crater

LAVA DOME

EXAMPLE

Mt. St. Helens

•Forms inside a previously erupted volcano.•Lava domes up and cools inside an old volcano.

What comes out of them?

LAVA FLOWS

Pahoehoe-ropey

Aa-blocky

Lahar or Mud flow

Volcanic Ash

Lapilli(little stones)

Ash Fall

Volcanic Gases

World’s Largest Volcano

Mauna Loa

Erupted -33 times

World’s Smallest Volcano

Taal

Erupted-33 times

Volcanic Eruptions areResponsible for Thousands

Of Deaths Each Year