Daily Review #6How are earthquakes created?How are P, S and surface waves

similar? Different?What is a tsunami and how is it

made?

Volcanic Eruptions

10,000 times stronger than atomic bomb

Volcanoes – what are they?

DestructiveCreative

What’s Inside?

Magma vs. lava

Magma chamber

Vents

Convergent Boundaries

Subduction◦Oceanic

subducted

◦Produces magma

Magma rises to form volcano

Explosive Eruptions

RareDestructiveProduce clouds of

◦Debris◦Ash◦Gas

Pyroclastic Flows

Produced in small amounts of time, large amounts of material

LaharFaster than a

hurricaneTemperatures

greater than 700 deg. Celsius

Deadly

Divergent Boundaries

Rift zone◦Filled by

magmaMid-ocean

ridges◦Most volcanic

activity◦Iceland, island

of Surtsey

Nonexplosive Eruptions

Most commonProduce

◦Calm lava flows◦Huge amounts of

lavaShape our world

◦Islands in the Pacific

◦Sea floor◦NW U.S.

Hot Spots

ExamplesVolcanically

activeFar from plate

boundaryTheories

◦Mantle plumes◦Cracks in crust

Move over time