| Let us begin with some sea- floor spreading. Here are some facts. The mid-ocean ridge is the longest chain of moutains in the world. a device that bounces sound waves off underwater objects is called sonar. |
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| plate tectonics is the lithosphere broken up into plates that move. Lithosphere top half of mantle bottem of crust. |
| The procese that continally adds new matireal to the ocean floor is sea floor spreading. If you need help with sea floor preading go to google.com and type it in to the search box. |
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