Sea Floor Spreading

Sea- story spreading is the make in which the ocean floor is prolonged when two cases move a dampen. As the plates move apart, the rocks break and earn a crack between the plates. Earthquakes occur along the plate boundary. Magma rises through the cracks and seeps out onto the ocean floor requirement a long, thin, undersea volcano.

Sea floor Spreading figure
(Fig 1.11) Sea floor Spreading.

As magma meets the water, it cools and solidifies, adding to the edges of the sideways-moving plates. As magma piles up along the crack, a long range of mountains of mountains forms piecemeal on the ocean floor. This chain is called an oceanic ridge. The boundaries where the plates move apart are constructive because new incrustation is being formed and added to the ocean floor. The ocean floor gradually extends and thus the size of these plates increases. As these plates get bigger, others become small as they melt back into the Earth in the process called subduction.

The new rock at the edge has no sediments like the sand or mud, since it is formed only recently.



Farther by from the ridge, sand and mud gradually settle on it, in an ever-thickening blanket. The oldest rocks whitethorn have 14,000 feet of sand and other sediments resting on aggrandisement of it.

An example of an oceanic ridge is the Mid-Atlantic Ridge. It is one part of a system of mid-oceanic ridges that stretches for 50,000 miles through the worlds oceans. The underwater mountains of the ridge may not be more than two miles higher than the touch sea floor.

On the whole, sea-floor spreading is basically volcanic, but it is aIf you want to get a full essay, order it on our website: Orderessay



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