WebA trench is a long, deep depression in the ocean floor. A trough is a gently sloping depression in the ocean floor. An island is a body of land surrounded by water. A ridge is long, narrow elevation of earth. A gap is a steep-sided opening through a mountain ridge. A seamount is an underwater mountain. Websea-floor spreading The process by which new oceanic lithosphere forms at mid-ocean ridges is called sea-floor spreading. As tectonic plates separate, the sea floor spreads apart and magma fills in the gap. Magnetic reversals are recorded over time in oceanic crust. How is new crust formed at the Mid-Ocean Ridge?

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WebOcean floor mapping About two thirds of the Earth's surface lies beneath the oceans. Before the 19th century, the depths of the open ocean were largely a matter of speculation, and most people thought that the ocean floor was relatively flat and featureless. ... new magma rose and erupted along the spreading ridges to form new crust. In effect ... WebNew ocean floor forms by sea floor spreading 4. Describe how ocean basin shrinking takes place at convergent boundaries. Give an example of this process. When two tectonic plates collide, the oceanic plate is submerged by the tectonic one because it is denser. The plate dives into the mantle and is consumed. busch gardens year passes

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WebWhen molten material erupts through the mid ocean ridge called sea-floor spreading What happens to the rock along the ridge when new molten material erupts? The older rock … WebThe majority of the system is underwater, with an average water depth to the top of the ridge of 2,500 meters (8,200 feet). Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the … WebDec 7, 2012 · Seafloor spreading occurs at the boundary between two tectonic plates. As the plates divide, magma comes up through the crack and cools to form new sea floor. The … busch gardens year pass