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Plate Boundaries

Types of Plate BoundariesConvergent BoundariesDivergent BoundariesTransform Fault Boundaries

Convergent BoundariesConvergent Boundaries exist when two plates

are colliding together. There are three different types of Convergent Boundaries: 1. Ocean:Ocean2. Ocean:Continent 3. Continent:Continent.

Exists when two plates are being pushed together.

Ocean: Ocean ConvergentTwo oceanic plates colliding, one has to give

and one goes down as the other one rises up. Most have the same density.

Creates volcanoes and earthquakes caused by the faults.

Example

The Ring of Fire

Ocean:Continent ConvergentOceanic crust will always go down and the

continental crust will always go up, because the continental crust is more dense.

Earthquakes are caused by the trenches.Partial melting of oceanic and continental

crust cause explosive magma.

Example

The Mariana Trench – Underwater Volcanoes!

Continent:Continent ConvergentCauses a lot of faults by the rocks pushing

together. Potential for earthquake activity.No volcanoes because there is no subduction

zone.Enormous mountain ranges.

Example

East Africa

Divergent Plate BoundariesExists when two plats are being pulled apart

from one another.There are two different types of Divergent

Plate Boundaries:1. Ocean:Ocean 2. Continent:Continent

Ocean:Ocean DivergentNew crust is being made.Underwater mountains and volcanoes exist.Also called a spreading center, the further

away from the spreading center, the older the crust.

Example

Mid Atlantic Ridge

Continent:Continent DivergentWhen a continental crust is pulled apart, it

causes a rift valley.Not making any new crust.

Example

The Appalachian Mountains

Transform Fault BoundaryExists when two plates are sliding past one

another.There are two types of Transform Fault

Boundaries:1. Ocean:Ocean2. Continent:Continent

Ocean:Ocean or Continent:Continet Transform FaultSqueezed in different directions.As they move, earthquakes happen. They can

be along side any other plate boundary.

Example

The San Andreas Fault

Which Plate Boundaries Cause

Volcanoes?

Ocean:Ocean ConvergentOcean:Continent ConvergentOcean:Ocean Divergent