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

• rain water

• groundwater

• water vapor

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The water in ponds and lakes is

• moving

• deep

• still

• salty

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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%

• 71%

• 30%

• 3%

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People can obtain groundwater by drilling a well

• above the water table

• into an aquifer

• into the unsaturated zone

• into the impermeable layer

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The streams and small rivers that feed into a main river are called

• watersheds

• tributaries

• divides

• wetlands

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Wetlands provide habitats for many living things because of their sheltered waters and

• large supply of nutrients

• thick layer of mud

• lack of insects

• ability to prevent floods

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Water that falls to Earth as rain , snow, sleet, or hail is called

• condensation

• evaporation

• precipitation

• transpiration

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A lake that stores water for human use is called a(n)

• reservior

• dam

• oxbow lake

• pond