RLNI+1.4

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Vocabulary

 * Mid Ocean Ridge**: longest chain of mountains in the world
 * Sonar**: a device that bounces sound waves off underwater objects and then records the echos of these sound waves
 * Sea Floor Spreading**: a process that continually adds new material to the ocean floor
 * Deep Ocean Trench**: forms where the oceanic crust bends downward
 * Subduction**: the process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle

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 * Outline**

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 * Mapping mid ocean ridge
 * Evidence sea floor spreading
 * Evidence from molten material
 * Evidence from magnetic strips
 * Evidence from drilling samples
 * Subduction at deep ocean trenches
 * Subduction and earth's ocean
 * Subduction in the Pacific Ocean
 * Subduction in the Atlantic Ocean