Plate+tectonics

__ MID-OCEAN RIDGE __
 * an Undersea mountains that has a narrow valley on the center.
 * it is formed as plate tectonics move and magma rises from asthenosphere, creating a new ocean floor



2.the closer the sediment is to the ridge the younger it is 3. rock undersea are younger that rocks on land 4. larges single volcano on earth
 * __ facts: __ 1.sediment near the the ridge is thinner that the rest spread around the ocean floor



__ Evidence: __ - first discover by Alfred Wegener, but did not have enough evidence to prove his hypothesis (two decades after his dead there was enough evidence to prove his hypothesis) -1947group of scientist map out the mid-Atlantic ridge




 * __ helpful websites __**

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