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Types of plate boundariesDivergent plate boundary Oceanic spreading ridge Continental Rift zone New rock produced Convergent plate boundary Oceanic-oceanic convergence Continental-continental convergence Mountains Uplifted Oceanic - continental convergence Subduction, Mountains, Volcanoes Old rock destroyed at Trench Transform plate boundary Earthquakes
Divergent plate boundaries
Oceanic spreading ridge E.g. Mid-Atlantic ridge
new basaltic magma rises to the surface along the ridge forming new oceanic crust
What the central rift looks like in a spreading ridge
Continental Rift zone E.g. Africa and Iceland
Divergent plate boundaries on land form rift valleysDivergent plate boundaries on land form rift valleys. New oceans are starting to open in these places. These rift valleys often have volcanoes lining them.
Diagram of a rift valley E.g. West African rift
Oldoinyo volcano erupts inside the Africa rift zone
Rift valleys will increase in size till water fills them to form a Sea
So was the Atlantic Ocean!The Red Sea and the Gulf of Aden were once rift valleys. So was the Atlantic Ocean!
The formation of the Atlantic ocean
Convergent plate boundaries
Types Convergent plate boundariesOceanic-oceanic convergence E.g. Japan, New Zealand Oceanic - continental convergence E.g. Andes, Sierra Nevada's Continental-continental convergence E.g. Himalayas
Oceanic-oceanic convergenceSubduction zone with deep trench!
Trench Island arc Piled up sedimentary rock: This rock will go through the rock cycle as the ocean floor subducts (metamorphic then melt into magma)!!
Japan is an example of an Island Arc systemTrench Island arc
The sub-continent of India has collided with the Eurasian continent to form the: Himalayas and Mnt. Everest!!
Old ocean sediments Mountains: Folded Rocks due to collision Uplifted plateau
Oceanic - continental convergence:Subduction Zone!! – Rock is DESTROYED! Crust is pushed up: (UPLIFT) – Mountain building. E.g. Andes mountains
Transform plate boundaries
North American plate Pacific plate
Volcanoes and Plate boundaries
The interior of Planet Earth
Model of the Earth’s interior
Model of how convection currents in the mantle drive plate tectonics
Plate boundaries and Hot spots
Types of Plate Boundaries
Major Geological Events
You may wonder… Why are the continents moving?. Seafloor Spreading The oceans are widening along the mid- ocean ridges.
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