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Transcript of Plate Tectonics
- They move because nuclear reactions in the core that produce heat
- The heat causes the mantle material to expand and rise toward the surface.
- When it reaches the surface, it cools and moves downward due to gravity
- This cycle of the convection currents and the effect of the gravitational forces cause the plates to move. The Earth's Plate Movement so now we know... the crust of the earth is divided into plates these plates "float" on the partially melted mantle (asthenosphere) over a long period of time these plates have moved around the earth creating the land masses we have today Interactions between plates There are 3 ways that plates can interact with each other moving together - converging moving apart - diverging and moving past one another - transforming http://blue.utb.edu/paullgj/physci1417/Lectures/Conv_Cont_Ocean.JPG http://www.teleseismic.net/aboutearthquakes/aboutearthquakes_files/image007.jpg so now we know... ~ The crust of the earth is divided into plates
~ These plates "float" on the partially melted mantle (asthenosphere)
~ Over a long period of time these plates have moved around
the earth creating the land masses we have today
~ There are 3 ways that plates can interact with each other
moving together - converging
moving apart - diverging
moving past one another - transforming
~ The plates move because of strong convection currents in the mantle
Subduction zones A subduction zone is a convergent boundary where one edge of a tectonic plate moves under another one. subduction zones are usually associated with volanoes and earthquakes. Transform boundary The San Andreas Fault is an example of a transform boundary. the eastern plate is moving south and the western plate is moving north Google: "plate tectonics evidence fossils" first website result http://www.visionlearning.com/library/module_viewer.php?mid=65