5Divergent BoundaryPlates are moving apart or separating
6Divergent Boundary: Oceanic-Oceanic Also known as seafloor spreadingPlates are separating from each other as a new land mass formsThis is seen at mid-ocean ridges and riftsPlate separation is a slow process. For example, divergence along the Mid Atlantic ridge causes the Atlantic Ocean to widen at only about 2 centimeters per year.
8Divergent Boundary: Continental-Continental Effects that are found at this type of plate boundary include:a rift valley sometimes occupied by a long linear lakes or a shallow arm of the oceannumerous normal faults bounding a central rift valleyshallow earthquake activity along the normal faultsVolcanic activity sometimes occurs within the rift
9Divergent Boundary: Continental-Continental African Rift Valley
10Convergent BoundaryPlates are moving towards each other
11Convergent Boundary: Continental-Continental Two continental plates collide & crumple the edges of the platesForm mountainsWe can see the end result of the collision between the Indian & Eurasian plates which are the Himalayan Mountains.
13Convergent Boundary Subduction: Oceanic-Continental When an oceanic plate goes underneath a continental platecalled subductionThis forms a trench or deep valley where the plates meet.An example of a subduction zone is the Marianas Trench in the Pacific Ocean where the Pacific Plate is subducting under the Eurasian Plate.
15Convergent Boundary Subduction: Oceanic-Oceanic Older, more dense plate subducts below the other plateThe subducted plate melts and begins fracturing its way through the rock aboveVolcanic cones form and over time grow higher than sea level—island chains are producedExamples: Japan, the Aleutian islands and the Eastern Caribbean islands of Martinique, St. Lucia, and St. Vincent, and the Grenadines