Review Plate Tectonics #3Divergent Boundaries

The place where two plates move apart or diverge is called a divergent boundary.

#1 Sea floor spreading

Can you explain this diagram!?

What causes sea floor spreading?

This is a model of sea floor spreading at a divergent boundary is called a

mid ocean ridge.

Oceanic crust diverging from oceanic crust

Did you know that the Earth’s longest mountain range is underwater and is called the mid-ocean ridge?

: www.ocean.udel.edu

The Mid-Ocean Ridge system, shown above snaking its way between the continents, is more than 56,000 kilometers (35,000 mi)

long. It circles the earth like the stitching on a baseball!

Continental crust diverging from continental

African rift valley

Iceland’s rift valley

Review Plate Tectonics #4Transform Boundaries

A transform boundary is a place where two plates slip past each other, moving in opposite directions.

San Andreas Fault in California

Let’s Watch it in action!

http://www.youtube.com/watch?v=ZxPTLmg0ZCw