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Tectonic Plate Boundaries
Transcript of Tectonic Plate Boundaries
different pieces called tectonic plates. The places where the tectonic plates meet are called plate boundaries. This is an example of what happens at a convergent plate boundary when two continental plates collide. The ground at a convergent plate boundary starts off flat. As the two plates begin to push against one another, a small hill is formed. The hill gets larger and larger as the plates continue to push against one another. Eventually, a mountain is created. The Oceanic and Continental Crust start off flat. This is a map of where subduction occurs. As they push against each other, the oceanic plate dives under the continental crust and into the mantle. This happens because the oceanic crust is denser than the continental crust. The oceanic crust will dive farther under the oceanic crust. This will create a deep ocean trench. Another type of plate boundary is a divergent plate boundary. A divergent plate boundary is formed when two plates pull apart. When they pull apart, the part in between the pulling plates may crack and the mantle may be exposed. This is the beginning of a mid-ocean ridge. As the two plates pull apart, the crust in the middle of the moving plates gets thinner and will begin to hold water. An ocean may eventually form from the rift valley.
At the mid-ocean ridge magma is being poured slowly out of the mantle creating new crust. To make room for this new crust, older crust is put back into the mantle through a process called subduction. The Himalaya mountain range is one example of a convergent plate boundary. It was formed when Asia and India collided. The Himalayas is the world's tallest mountain range. http://pubs.usgs.gov/gip/dynamic/himalaya.html Now that you know what happens when two continental plates collide. What do you think happens when oceanic and continental plates collide. Subduction occurs when a plate carrying continental crust and a plate carrying oceanic crust collide. This is an example of subduction These are some examples of rift valleys. These are some examples of mid-ocean ridges. The last type of plate boundary is a transform plate boundary. The San Andreas Fault in California
is an example of a strike slip or
transform plate boundary. This is an example
of a strike slip or
transform plate boundary. The two plates start
side by side. Pressure builds as the
two plates push past
each other. The sliding plates push
farther and farther apart
causing earthquakes. This type of plate boundary is called a strike
slip of transform plate boundary.