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Seafloor spreading is the formation of new areas of oceanic crust and it occurs through the up-welling of magma at mid-ocean ridges. Seafloor spreading causes valleys and new crust to form. If plates are divergent then they are separating and also causing valleys. The magma comes out and once it comes into contact with the water, new land forms and a line of seamounts and under water mountains form on the land. Iceland's volcanoes are formed on divergent plate boundaries meaning that the plates move apart.
http://mail.colonial.net/~hkaiter/Aaa_web_images2012/sfsMidOceanSpread.jpg
http://mail.colonial.net/~hkaiter/Aaa_web_images2012/sfsMidOceanSpread.jpg
![Picture](/uploads/2/3/8/7/23878289/8865358.gif)
Scientist Alfred Wegner proposed a theory of continental drift. He said that once all continents would fit together like puzzle pieces but now, slowly, the continents move around drifting away from each other.
Continental drift is when the continents move throughout Earth's surface. If the plates are convergent then they can cause earthquakes and mountains. The picture shows the how all continents were connected together and due to continental drift, they have separated and are in different places now.
http://3.bp.blogspot.com/-zHXFCFXYHB0/Tx6VTQF8BHI/AAAAAAAAD4s/-Z83vGXdKm8/s1600/continentaldrift.gif
Continental drift is when the continents move throughout Earth's surface. If the plates are convergent then they can cause earthquakes and mountains. The picture shows the how all continents were connected together and due to continental drift, they have separated and are in different places now.
http://3.bp.blogspot.com/-zHXFCFXYHB0/Tx6VTQF8BHI/AAAAAAAAD4s/-Z83vGXdKm8/s1600/continentaldrift.gif