Post on 03-Jul-2020
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Origin of Ocean Water Oceans have filled over hundreds of millions of years.
They are estimated to be over 3 billion years old.
Water may have come from volcanic eruptions when the vapour cooled and condensed.
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Some believe the water came from ice comets.
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Processes that lead to the development of ocean basins:
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Review...
The entire surface of Earth is made up of large, slow moving sections of rock called tectonic plates. These are solid but float over a layer of molten rock called magma.
As the magma heats up, the molten rock rises. This pressure can force the two plates apart.
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1) Plate tectonics
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2) Volcanic action
Underwater volcanoes are generally found at the edges of tectonic plates.
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When volcanoes erupt underwater, new oceanic crust is formed by the hot molten rock slowly cooling and solidifying.
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Volcanoes have built ocean floor along midocean ridges in areas where plates separate.
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Volcanoes have helped build continental divides in areas where plates have collided and mountain building occurs.
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3) Erosion
The process by which the surface of the earth is worn away by the action of water, glaciers, wind, waves, etc...
This causes material to be deposited in ocean basins.
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4) Glaciation
A force of erosion in the development of continental drainage systems.
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When glaciers melt, the water that they release wears away the earth as it flows down to the oceans and other drainage basins.
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Foldable Tab #1
Inside tab:
List the four processes that lead to the development of ocean basins.
Provide a brief description for each process!