CJKN+1.4

Vocabulary:
Sea-floor spreading:The process that continually adds new material to the ocean floor. Mid-ocean ridge: The longest chain of mountains in the world Sonar: A device that bounces sound wave off under water objects and then records the echoes of these sounds waves Deep-ocean Trenches: A deep ocean trench( under water canyon) forms where the oceanic crust bends downward Subduction: The process by which the ocean floor sinks beneath a deep ocean trenches and back into the mantle

Outline

 * Subduction and Earth's Ocean
 * Subduction in the pacific ocean
 * Subduction in the Atlantic ocean
 * Subduction
 * The ocean floor sinks into trenches
 * Evidence form sea floor spreading
 * Evidence from molten material
 * evidence from magnetic stripes
 * evidence from drilling samples
 * Mapping the mid-ocean ridge
 * with sonar
 * Subduction at deep ocean trenches
 * The ocean floor sinks into trenches
 * magnetic strips/ sea floor spreading