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Moving Plates

Researchers aboard the ship crackscanyonsAtlantismagmaSelect your answer explored the sea floor. They used depth ridgestrenchessounderscanyonsSelect your answer to map the bottom surface of the Atlantic Ocean. These researchers discovered the Mid-Atlantic Ridge—mountains separated by crackssounderscanyonsmagmaSelect your answer and valleys. A model called rock materialsea-floor spreadingcanyonstrenchesSelect your answer states that new crustal material is forming in the sea floor. It pushes apart the old sea floor on both sides of the ridgessoundersmagmatrenchesSelect your answer as it forms. Beneath, there is molten rock called magmatrenchesrock materialcracksSelect your answer. This flows up through the crackssounderscanyonstrenchesSelect your answer, then cools and hardens. This process makes new ridgesrock materialsea-floor spreadingsoundersSelect your answer while pushing older rock material away along the sea floor. Other oceans also have mid-ocean ridges. Some of these ridges have huge crackstrenchescanyonsrock materialSelect your answer on top and other parts of the sea floor have deep valleys, or crackssounderstrenchesridgesSelect your answer.