Friday, February 5, 2010

How does the presence of ocean ridges and trenches support the theory that the continentals move?

this theory is called plates tectonic theories, it doesn't deal only with movement of the continents but the movement of the plates (plates can be continental, oceanic or mixed of both of them)


this theory was formed due to lots of the evidences that show high similarity in different continents, there are a lot of these evidences in the below link:


http://csep10.phys.utk.edu/astr161/lect/鈥?/a>


but there was still a problem: how those continents could move on the fixed oceanic crust





now we show that these oceanic crust are not fixed


at first we should know what happen in these two places:


as you may know oceanic ridge is a place that magma comes out from mantle to the surface and new oceanic layers form, this newly formed oceanic crust pushed adjacent layers along the subduction zone


in the other hand in the trenches(subduction zone) oceanic crust subducted into the mantle and melted again


these phenomena show that the oceanic crust moves


How does the presence of ocean ridges and trenches support the theory that the continentals move?
movement has been measured.How does the presence of ocean ridges and trenches support the theory that the continentals move?
Scientist can answer your question!

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