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Presentation transcript:

Plate Tectonics BoundariesEarthquakes VolcanoesRandom

What was the name of the super continent?

Pangaea

Who came up with the theory of continental drift?

Alfred Wegener

Describe the theory of continental drift in detail

continents move away from each other Started as one large continent 250 million years ago Plates move 1-2 cm per year

Give 3 pieces of evidence for continental drift

Fossils found where they couldn’t live Continents seem to fit together Mineral deposits on edges of continents

Name the plate that we currently live on and the plate directly to the West of us

North American plate & Pacific plate

Name the boundary that rubs past in opposite directions and tell what it can cause

Transform Earthquakes

Name the boundary where plates come toward each other and tell what it can cause

Convergent Mountains

Name the boundary where plates go away from each other and tell what it can cause

Divergent Trenches and volcanoes

Name the boundary where one plate sinks under another and tell what it can cause

Subduction Volcanoes

Name the volcano that is an exception to the rule and explain how it was made

Hawaii Magma pushing through the middle of a plate

Name all three seismic waves

P-Primary S-Secondary L-Surface

What can Primary & Secondary waves travel through

P-solid and liquid S-solid only

Name the transform boundary in the U.S.

San Andreas Fault

How do geologist know that the outer core is liquid?

How do geologist know that the core is liquid? Because the S waves do not come out the opposite side of the earth (S wave shadow)

How do geologist know that the inner core is solid?

Because of the way that the P waves bend due to refraction as they go through the Earth

What type of boundary do volcanoes usually form on?

Subduction

Name a volcano that has recently erupted in the United States

Mount St. Helen

Name the 3 possible statuses of a volcano

Active, Dormant, Extinct

What is the bowl on the top of a volcano called?

Caldera

Name the 3 types of volcanoes and tell how each is formed

Shield- oozing lava Cinder cone- exploding rocks & ash Composite or Strata cone- alternates

What is the difference between Magma & lava?

Magma is in the Earth, Lava is on the Earth

What are the scientists called who study the Earth?

Geologists

How long ago did Pangaea exist?

million years ago

What allows the plates to move?

The asthenosphere

Where do almost all volcanoes and earthquakes occur?

On plate boundaries