Test: 5th Grade Science

1.
About 71% of Earth's surface is covered by water and of that 97% is saltwater located in oceans. The water in the ocean only contains about three to four percent salt. If you wanted to replicate this at home, you could mix six ounces of water with a teaspoon of salt, and it would be the same salinity as ocean water. Oceans become saltier over time as water evaporates, and small amounts of salt are carried to the oceans by rivers.
 
Select which statement is true.

Oceans only contain three to four percent of the Earth's water

97% of the water on Earth is comprised of saltwater

Rivers are one teaspoon of salt to every six ounces of water

Oceans become saltier over time because of condensation

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