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UXL Encyclopedia of Water Science by K. Lee Lerner, K. Lee Lerner, Brenda Wilmoth Lerner

By K. Lee Lerner, K. Lee Lerner, Brenda Wilmoth Lerner

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At that time, the atmosphere on Mars was similar to Earth’s atmosphere today. It contained much carbon dioxide that helped keep the planet warm. Most scientists assume that at that time the planet was warm enough for water to form as a liquid and that an ocean existed on Mars. When scientists cut the meteor open, they found microscopic structures in the rock that look a lot like fossilized bacteria (microscopic single-celled organisms) from Earth. The only difference is that the structures in the Martian rock are about 100 times smaller than bacteria on Earth.

Water chemistry: The balance of nutrients, chemicals, and minerals in water. Water footprint: The amount of water used by an individual, business, community, or nation. Water right: Grants a right to use water but not ownership of the waterway. Water table: The zone above which the spaces in the soil and rocks are not completely filled with water and below which the soil and rock spaces are completely filled with water. Water treatment: A series of steps that makes water potable and removes chemicals and microoganisms that could be harmful to the natural environment.

Shoreline: A strip of land within a coastal zone that is submerged by high tide; also called shore zone. Sidescan sonar: Type of sonar that emits sound energy over a wide path, tens or hundreds of miles (kilometers) across, allowing scientists to map large areas of the ocean. Silt: Sedimentary particles smaller than sand particles, but larger than clay particles. Words to Know xxxix Sinkhole: A crater that forms when the roof of a cavern collapses; usually found in limestone rock. Sludge: A semisolid residue, containing microorganisms and their products, from any water treatment process.

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