have salinity ranging in between 1% and also 4.1%.FEEDBACK: Average an international sea-surface temperature is 17°C, but it can variety from freeze to almost 35°C in the tropics. The densest water in the oceans is at depth, and also there are bottom currents that circulate close to the s floor.

You are watching: Epicontinental seas have occurred in the past when


Around deep-sea hydrothermal vents, major producers use as their energy source the chemistry bonds in
sulfide minerals.FEEDBACK: approximately deep-sea hydrothermal vents, the major producers room microbes that usage the chemical bonds in sulfide minerals as their energy source.
nutrients from farm yard runoff causes algal blooms that use up oxygen.FEEDBACK: Dead zones happen when over there is a lack of oxygen in the water, bring about fish and shellfish to die. They often happen naturally, particularly during feather algal blooms, however the dead zone in ~ the mouth of the Mississippi flow is worsened by the high quantity of nutrients brought into the Gulf of Mexico from ranches upstream. The nutrients feed algal blooms that reason reduced oxygen for fish and also shellfish.
sea levels to be higher.FEEDBACK: Epicontinental seas developed when sea level rose, no fell; sea level has been both greater and lower than it is today. Continental shelves space exposed once sea level falls, not once it rises. Tides carry out not beat a function in the development of epicontinental seas.
are flow mouths flooded by seawater.FEEDBACK: Estuaries room flooded flow mouths v brackish water who salinity is as well low to type brine. Flooded glacial valleys are dubbed fjords.
circular and clockwise in the north hemisphere.FEEDBACK: circulation of water in gyres is circular and also clockwise in the north hemisphere. That is counterclockwise in the southerly hemisphere.

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contains dissolves salts, like halite and also gypsumFEEDBACK: The median salinity is about 3.5%. Seawater includes many liquified salts, including halite and also gypsum, and also has a higher density than freshwater. As seawater evaporates, salt is left behind; therefore, s water salinity rises with evaporation.
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