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25 Cards in this Set

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