Barnett - Oceanography 1
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| salinity | amount of solid material (like salt) dissolved in water
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| deep ocean trench | place on the seafloor where one plate is subducting beneath another and a long narrow depression forms
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| mid-ocean ridge | a chain of underwater mountains
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| upwelling | the rising of cold water from deeper layers to replace warmer surface water that has been moved away; brings nutrients to the ocean surface
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| abyssal plains | deep, extremely flat features
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| density | a measure of the amount of matter in a given space
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| continental shelf | part of the ocean next to the continent that is shallow and fairly flat
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| continental slope | part of the ocean next to the continental shelf where the seafloor drops off at a steep slope
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| current | a mass of water is moved by wind or density differences to another part of the ocean
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| El Nino | periodic warming of the ocean that occurs in the central and eastern Pacific; can change the weather in many parts of the world
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| thermocline | layer of the ocean around 300 to 1000 meters deep where there is a rapid change in temperature with depth; creates a barrier for many marine life forms
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| Pacific | this is Earth's largest ocean
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| Arctic | this is the smallest, most shallow ocean
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| continental rise | Gradual incline between ocean basin and continental slope
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