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How is there a raise in water level??

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posted on Aug, 27 2009 @ 09:07 PM
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Im not that smart in geology or ananything. Can someone explain to me how water levels rise and fall during times on earth. At one time it was 600m higher then it was today , and at another time it was 100m less then today. How does it rise and fall??? were does this water come to make it rise/ or fall?




posted on Aug, 27 2009 @ 09:32 PM
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reply to post by Maddogkull

The amount of water existing as ice on the land masses will have some effect on ocean levels. During an ice age, when glaciers form in large quantities over the land, there is less water in the oceans and therefore a lower sea level. During warmer periods, there is less ice existing as land-based glaciers and therefore the sea level is higher.

Most of the large differences, however, can be attributed to tectonic activity. That is, massive plates that make up the earth's surface can move slowly against each other. Sometimes they are thrust upward from the pressure of two advancing plates; sometimes one plate is buried beneath another. Differences in pressures under the crust due to this movement can also cause areas of land to rise and fall without being on the junction of two plates.

I hope that cleared things up for you.

TheRedneck



posted on Aug, 27 2009 @ 09:34 PM
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reply to post by Maddogkull
 


Ice caps

as more water is locked up in ice seal levels get lower and visa versa



posted on Aug, 27 2009 @ 09:38 PM
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The Moon causes tidal waves. The interaction of gravity between the moon and the Earth causes the tides to rise and fall each day.

On a longer time scale, water expands while going from 4 to 0 D' C. Water expands when it turns into ice. It contracts when released back into the oceans as water.

Hope that answers your question.



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