types of plate boundaries. when 2 plates meet….. 1- they can crash together =...
TRANSCRIPT
Types of Plate Boundaries
When 2 plates meet…..
• 1- They can crash together =
• ConvergentConvergent BoundaryBoundary OROR
• 2- They can move away from each other = Divergent Divergent BoundaryBoundary OROR
• 3- They can slide past each other = Sliding/Transform Sliding/Transform BoundaryBoundary
Convergent Boundaries• There are two types of Convergent
Boundaries:
–A. SubductionSubduction: when one plate is more densedense than another, the more dense plate goes underneathunderneath the less dense plate.
The 2nd type is collision
Subduction
Convergent Boundaries:Subduction
• One plate goes under the other
• Features that occur: Earthquakes, Volcanoes, Ocean Trench
Remember:
“The Ocean floor is going DOWN!!!!”
Example• Mt. St. Helens- Juan de Fuca plate goes
underunder the North American Plate.
What are some indicators that a volcano might erupt soon?
Convergent Boundaries, Collision– B. . CollisionCollision: when the 2 plates are the same
material. When they hit, they both buckle upbuckle up– (this makes mountains)
• The two plates have the same density, they buckle up and move to a higher elevation
• Features: Earthquakes, Folded Mountains
Example• Mt. Everest, Himalayas
• The plates are still colliding and gaining Elevation
What are some forces of nature that keep Everest from getting much higher?
Divergent Boundaries• When two plates
move apart.• Features:
– In continents: – Rift Valley,
Volcanoes, Earthquakes
– In oceans: – Mid-Ocean Ridge,
Volcanoes, Earthquakes
Examples:
• Great Rift Valley, Africa
• Mid-Atlantic Ridge, Atlantic Ocean
Example: Great Rift Valley, Africa
Sliding/Transform Boundary• When two plates slide past each other.
• Features: Earthquakes
Example:California- Pacific Plate
slides past the North American Plate at the San Andreas Fault.
Example: San Andreas FaultWhere is it?