Hydrosphere EOG review

A water molecule is made up of

• two hydrogen atoms bonded to an oxygen atom.

• two hydrogen atoms bonded together.

• two oxygen atoms bonded to a hydrogen atom.

• two oxygen atoms bonded together.

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Because water consists of polar molecules,

• most of it is found at the North and South Poles.

• water molecules tend to stick together.

• it falls as sleet or snow when temperatures are cold.

• it can be attracted using a magnet.

Tightness across the surface of water that is caused by polar molecules pulling on each other is called

• surface tension.

• capillary action.

• condensation.

• polar action.

Water is often called the universal solvent because

• it can cling to the fibers of paper and cloth.

• it dissolves so many substances.

• it exists in all three states on Earth.

• its frozen form floats on its liquid form.

Water is the only substance on Earth that

• a. commonly exists in all of its different states.

• b. freezes at very low temperatures.

• c. boils at very high temperatures.

• d. exists in the liquid state.

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The process by which a gas changes into a liquid is called

• evaporation.

• condensation.

• melting.

• freezing.

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Plants use water to

• release as a waste product.

• keep predators away.

• make their own food.

• attract pollinators.

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Approximately what percentage of Earth's water is fresh water?

• 97 percent

• 71 percent

• 30 percent

• 3 percent

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As water moves slowly through a wetland, some waste materials settle out, some wastes are absorbed by plants, and silt and mud is trapped by plant roots. In this way, wetlands act as natural

• filters.

• habitats.

• tributaries.

• artesian wells.

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Water that fills the cracks and spaces in underground soil and rock layers is called

• salt water.

• rainwater.

• groundwater.

• water vapor.

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