Friday, March 14, 2008

Tectonic Plates Movement

How do tectonic plates move?
This image is a cross section through the Earth showing the convection cells of the mantle. Ridge push happens at spreading centers where plates are moving apart. Slab pull happens at subduction zones where one plate is pulled down into the mantle.

Plates at our planet’s surface move because of the intense heat in the Earth’s core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down. As the cooled material sinks down, it is warmed and rises again.

Scientists once thought that Earth’s plates just surfed on top of the mantle’s giant convection cells, but now scientists believe that plates help themselves move instead of just surfing along. Just like convection cells, plates have warmer, thinner parts that are more likely to rise, and colder, denser parts that are more likely to sink.

New parts of a plate rise because they are warm and the plate is thin. As hot magma rises to the surface at spreading ridges and forms new crust, the new crust pushes the rest of a plate out of its way. This is called ridge push.

Old parts of a plate are likely to sink down into the mantle at subduction zones because they are colder and thicker than the warm mantle material underneath them. This is called slab pull.

Tectonic plats shape the earth by running in to each other and moving apart and sinking and floating up off the sea floor. When they crash together one goes under another and turns in to magma or they make mountains.

Some examples are like the Rocky Mts. or the Appellations.


Anonymous said...

I really enjoyed reading your paper.
Actually i Enjoyed reading both of them. God Job looks like you worked really hard. -DT5

Anonymous said...

hey graet info loved reading it -CG5

Anonymous said...

good information but it sounds like that first part was copied from somewhere or something like that since it talks about an image that isn't there. also there are a lot of little spelling and grammar mistakes that could be fixed pretty easily.