hydrosphere

Which two elements make up water?

• hydrogen and oxygen

• oxygen and carbon

• helium and oxygen

• hydrogen and neon

97% of the water on the Earth is

• saltwater

• freshwater

3% of the water on the Earth is

• saltwater

• freshwater

What percent of the water is located in oceans?

• 97%

• 3%

• 96%

• 1%

Which type of water is usable to living organisms for survival?

• saltwater

• freshwater

Water is the only substance on Earth that

• exists in the liquid state

• boils at very high temperatures

• freezes at very low temperatures

• commonly exists in all 3 states of matter

An object that is more dense than the fluid in which it is immersed will

• neither rise nor sink

• rise

• sink at first, then rise slowly

• sink

The streams and smaller rivers that feed into a main river are called _______.

• head water

• watersheds

• tributaries

• watershed divides

Just as all the water in a bathtub flows toward the drain, all the water in a river system drains into a main river. The land area that supplies water to a river system is called a _______.

• divide

• watershed

• drainage canal

• river

Why is water from an aquifer more likely to be cleaner than water from other sources?

• because it forms where fresh and salt water meet

• because it receives water directly from precipitation

• because it rises to the surface near the ocean

• because pollutants are filtered by rock and soil deep within Earth