Plate Boundaries/Margins

What are the three types of destructive plate boundary?

• oceanic vs. continental

• oceanic vs. oceanic

• continental vs. continental

What motion occurs at destructive oceanic vs. continental plate boundaries?

• one plate is forced under another

• oceanic and continental plates move towards each other

• the denser oceanic plate subducts

• as the oceanic plate subducts, increased temperature and friction cause it to melt, creating a subduction zone

What hazards occur at destructive oceanic vs. continental plate boundaries?

• volcanoes

• earthquakes

• tsunamis

What is an example location of a destructive oceanic vs. continental plate boundary?

Nazca & South American plates

What motion occurs at destructive oceanic vs. oceanic plate boundaries?

• one plate is forced under another

• oceanic and oceanic plates move towards each other, both of the same density

• the faster moving plate is the one that subducts

• the features are the same as the continental-oceanic subduction zone

• an ocean trench marks the location where the plate is pushed down into the mantle

What hazards occur at destructive oceanic vs. oceanic plate boundaries?

• volcanoes

• earthquakes

• tsunamis

What is an example location of a destructive oceanic vs. oceanic plate boundary?

South American & Caribbean plates

What motion occurs at destructive continental vs. continental plate boundaries?

• one plate is forced under another

• two continental plates move towards each other

• as both plates are of the same density, there is no subduction

• as the plates meet, sediment and the plate edges are forced to fold upwards

What hazard occurs at destructive continental vs. continental plate boundaries?

earthquakes

What is an example location of a destructive continental vs. continental plate boundary?

Indo-Australian & Eurasian plates

What motion occurs at constructive plate boundaries?

• plates pulling apart, moving away from each other

• a gap is created between the plates

• magma (molten rock) rises from the mantle and fills the gap between the plates, forming a mid-ocean ridge

What hazards occur at constructive plate boundaries?

• volcanoes

• earthquakes

What is an example location of a constructive plate boundary?

North American & Eurasian plates

What motion occurs at conservative plate boundaries?

• two plates grind past each other

• the plates often get stuck due to friction

• friction builds up over time until the plates finally jolt past each other

What hazard occurs at conservative plate boundaries?

earthquakes

What is an example location of a conservative plate boundary?

Pacific & North American plates