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25 Cards in this Set
- Front
- Back
oceans are important for....
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food, minerals transportation, climate
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oceans were made...
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by volcanoes 4 billion years ago. the volcanoes relseased water vapor into the atmosphere , when this cooled enough, it began to condense into torriental rains. These rains filled low areas on earth called basins
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oceans cover_ % of land
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70%
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ocean water contain dissolved gasses such as:
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Carbon, Oxygen , nitrogen,
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oxygen gets into the ocean 2 ways:
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1. directly from the atmosphere
2. from plants using photosyntesys |
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Carbon dexiode gets into the ocean in w ways
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1. directly from the atmosphere
2. from animals when they respire |
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Nitrogen gets into the ocean in 1 important way
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from the atmosphere
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nitrogen is important in the fact,
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plants turn it into nitrates
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ocean water contains many ions, some of these include;
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calcium, magnesium, sodium
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ions in the ocean come from;
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dissolved rock that came from river beds and ground water
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the ocean contains many ions , these include,...
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chloride, sodium, sulfate, magnesium,calcium, potassium
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the most abundent elements in the ocean are
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hydrogen and oxygen (they make up the h2o of water)
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when seawater evoporates, ions form together to form
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hailate
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what is sailinity?
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the measure of the ammount of dissolved salt in water
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the salinity of ocean water is...
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3.5%
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the porportion of dissolved salt in seawater has remained
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nearly constant over the past hundred million years.
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do scientists think the oceans are becomming saltier?
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no
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the ocean are considered to be in a
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constant state
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elements are added to the ocean at the...
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same rate they are taken out
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they are removed when....
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ocean water evorporates leaving salt behind.
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some marine animals take calcium water to make...
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bones
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oysters and clams use calcium to make
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shells
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why are calcium and sylica removed more quickly then some other elements?
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because some organisms use them to make shells and bones
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what is the process of salt being removed from water called?
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desalination
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some methods of desalination include,....
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1. evoporating seawater and collection the freshwater
2. Passing salt water through a membrane 3. melting frozen seawater, the ice will be mostly freshwater |