Plate Tectonics

Plate Tectonics

Earth's Plates

• Earth's crust is broken into 2 plates

• Continental crust

• Oceanic crust

Multiple Choice

What causes the crust (plates) to move?

• Convection Currents

• Earthquakes

• Don't know

• Glaciers

3 plate boundaries

• Convergent

• Divergent

• Transform

Multiple Choice

Which boundary collides

• Convergent

• Divergent

• Transform

Multiple Choice

Which boundary divides

• Convergent

• Divergent

• Transform

Multiple Choice

Which boundary slides

• Convergent

• Divergent

• Transform

Transform boundaries

• When the crust (plates) shift or slide past one another, it isn't a smooth movement

• Earthquakes are felt when these plates move

• The crack in the crust is called a plate boundary or fault line

• The San Andreas fault in California is an example

Multiple Choice

What is the line (crack) called in the ground where 2 plates meet?

• Seafloor spreading

• Fault line

• Earthquake

Multiple Choice

What do we feel when plates move at a transform boundary?

• Tsunami

• Ocean waves

• Earthquake

Multiple Choice

What is a real life example of a transform boundary?

• Himalayan Mts

• Appalachian Mts

• Mid ocean ridge

• San Andreas Fault

Divergent Boundary

• Plates divide or separate

• This is called seafloor spreading

• Magma comes up and cools into rock to create new ocean crust

• A mid ocean ridge is formed (volcanic mountains)

• Younger rock is near the ridge and they get older as you move away

Multiple Choice

What is a mid ocean ridge?

• Volcanic Mountains

• Valley

• Lithosphere

• Asthenosphere

Multiple Choice

Which statement is correct?

• Older rocks are located near the ridge where magma flows out

• Younger rocks are located near the ridge where magma flows out

Convergent Boundary

• When 2 continental plates collide they fold up and make a mountain

Convergent Boundary

• When one continental and one oceanic plate collide, the heavier oceanic plate sinks

• This sinking process is called subduction

• The continental crust pushes up into a mountain

• The old subducting curst melts into magma forcing it to go up into the mountain making it a volcanic mountain

• A deep ocean trench is also formed when the oceanic plate sinks

Convergent Boundary

• When one oceanic plate collides with another oceanic plate, the older heavier oceanic plate will sink, or subduct

• A deep ocean trench is formed

• The older crust will melt into magma and form volcanic islands

Multiple Choice

What is formed at a convergent boundary when 2 continental crusts collide?

• Volcanoes

• Seafloor spreading

• Trench

• Mountains

Multiple Choice

What do we call it when the heavier, more dense plate sinks below another one?

• Submarine

• Subduction

• Gravity

Multiple Choice

What is formed at a convergent boundary when an oceanic and continental crust collide?

• Volcanoes and a trench

• Only volcanoes

• Only a trench

• Mountains

Multiple Choice

What is formed at a convergent boundary when 2 oceanic plates collide?

• Volcanoes and a trench

• Only volcanoes

• Only a trench

• Mountains