Find the Answer in Your Book Earth Science Chapter 13
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Describe three ways minerals leave seawater, thus lowering its salinity.
1. Some are absorbed by organisms to use in building their shells and skeletons. 2. Some clump together and fall to the bottom with sediment. 3. Some precipitate when they become too concentrated to remain dissolved.
Give at least three ways our lives are dependent on the existence of oceans.
It affects the weather, drinking water, gives us oxygen, food and transportation
Explain the difference between local sea level and mean sea level
Local: Always changing height of the ocean surface Mean: Zero height that cartographics and air craft pilot use to measure elevation
