Tuesday, September 29, 2009

HOW DO PLATE TECTONICS AFFECT THE EARTH'S CRUST?

Hello Fifth-Grades: Here's some information on plate tectonics to help you better understand this phenomenon. Remember, the Earth is always changing, always moving. The Earth's rocky crust (both oceanic and continental) is comprised of a series of plates that float on the semi-solid or magma-like mantle. Convection currents cause the magma to rise and fall, therefore, moving the Earth's plates in different directions. This movement is responsible for mountain building, volcanoes, and earthquakes.


Convergent Plates: When two continental plates converge or collide, the crust is squished together, folding and buckling and forming mountains. This is just one way mountains are formed.


Subduction Plates: When one continental plate and one oceanic plate collide, the more dense oceanic plate is subducted or pushed under the continental plate. As it plunges deeper into the mantle, the rock of the oceanic crust melts, becoming part of the mantle. An ocean trench forms at the plate boundaries. Volcanoes and earthquakes may happen here. In the case of volcanoes, molten rock rises until it erupts at the surface.


Divergent Plates: When plates spread apart or diverge,
magma rises up from the mantle and fills the gap, creating new crust. As this continues, volcanic islands may form at the surface.





Transform Plates: When plates grind against and past each other in opposite directions earthquakes may strike along these boundaries.





This map shows the continents and oceans and the plates on which they move.

8 comments:

Mohammed Mahfuj Sarker said...

Hi Ms.Seitz its me Mohammed.I just read all about"HOW DO PLATE TECTONICS AFFECT THE EARTH'S CRUST" and it was pretty good.I think that this website should be in the newspaper.And this website should have like 1 million kids talking to you but theres some things in life that you cant have. :(

Ms. Seitz said...

When I'm glad that you check into the website. Some kids tell me they do check it out but don't leave messages. Some kids don't have computers and some aren't allowed on. By the way, what school is your brother attending?

Mohammed Mahfuj Sarker said...

Oh well then that changes everything.My brother attends the school Montauk...or Montawk.I really dont know how to spell it but its montawk(probably spelled like that).

Ms. Seitz said...

It's actually spelled the first way- Montauk. Does he like it there? How is he doing?

khatha said...

Hi Ms.Seitz how are you it is I khatha this is my first time on this web site and I really think its helpful.
But i am still a little confused with the the plates? so can u give me some help?

khatha said...

merry,merry chirsmas!!!!!!!! ho!ho!ho!

Ms. Seitz said...

Khatha: Welcome! Well, we've moved on to variables, so if you have questions about variables, let me know.

Ms. Seitz said...
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