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Guide to plate movement

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Presentation on theme: "Guide to plate movement"— Presentation transcript:

1 Guide to plate movement
Plates on the Move Guide to plate movement

2 There are three types of plate movement

3 3 Types of Plate Movement
Apart - Divergent Together - Convergent Side by Side - Transform

4 Continental & Oceanic Crust
REMEMBER: Continental Crust Less dense (granite) Oceanic Crust More dense (basalt)

5 Divergent Boundary Plates are moving apart or separating

6 Divergent Boundary: Oceanic-Oceanic
Also known as seafloor spreading Plates are separating from each other as a new land mass forms This is seen at mid-ocean ridges and rifts Plate 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.

7 Divergent Boundary: Oceanic-Oceanic

8 Divergent 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 ocean numerous normal faults bounding a central rift valley shallow earthquake activity along the normal faults Volcanic activity sometimes occurs within the rift

9 Divergent Boundary: Continental-Continental
African Rift Valley

10 Convergent Boundary Plates are moving towards each other

11 Convergent Boundary: Continental-Continental
Two continental plates collide & crumple the edges of the plates Form mountains We can see the end result of the collision between the Indian & Eurasian plates which are the Himalayan Mountains.

12 Convergent Boundary: Continental-Continental
Himalayan Mountains

13 Convergent Boundary Subduction: Oceanic-Continental
When an oceanic plate goes underneath a continental plate called subduction This 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.

14 Convergent Boundary Subduction: Oceanic-Continental

15 Convergent Boundary Subduction: Oceanic-Oceanic
Older, more dense plate subducts below the other plate The subducted plate melts and begins fracturing its way through the rock above Volcanic cones form and over time grow higher than sea level—island chains are produced Examples: Japan, the Aleutian islands and the Eastern Caribbean islands of Martinique, St. Lucia, and St. Vincent, and the Grenadines

16 Convergent Boundary Subduction: Oceanic-Oceanic

17 Transform Boundary Plates are sliding past each other

18 Transform Boundary Plates are sliding past each other
Earthquakes occur Examples: San Andreas Fault in California & Alpine Fault in New Zealand

19 San Andreas Fault in California

20 Alpine Fault in New Zealand


22 Transform Convergent Divergent

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