How do ocean ridges and deep-sea trenches support the theory of seafloor spreading?

near ocean ridges new rocks are present


as you move farther from these ridges the rocks get older





(so that means rocks are continuously being formed at the ridge and then are moving away)





and then trenches pull the sea floor toward them, this is true because they get sub-ducted under the continental crusts and then when the lithosphere go down and melts magma forms which comes up and so forms volcanoes on the continental crusts.How do ocean ridges and deep-sea trenches support the theory of seafloor spreading?
%26lt;%26gt;The theory is that ridges represent weak spots that 'buckle' and trenches represent 'stretching' due to tectonic forces. Take a look at this site: http://platetectonics.pwnet.org/story_te鈥?/a>

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