Write at least two facts about Earth's salt water.

70% of the world is covered in salt water. This makes salt water ecosystems the largest on earth. It is estimated that almost 50% of all known species on earth are supported by salt water ecosystems. It is believed that there may be millions more species in the oceans that have not yet been discovered. 96.5% of all the Earth's water is contained within the oceans as salt water, while the remaining 3.5% is freshwater lakes and frozen water locked up in glaciers and the polar ice caps. Sodium, found in salt water, is an essential mineral. It helps regulate fluid balance and is required for muscle and nerve function. The body also uses sodium to control blood pressure and blood volume. However, Cecere warns that too much salt can lead to high blood pressure and cardiovascular disease.

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