Chapter 12 Water Test

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

• watersheds
• tributaries
• divides
• wetlands

As water moves slowly through a wetland, some waste materials settle out, some wastes are absorbed by plants, and silt and must 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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What causes cold, deep currents to from in the oceans near the poles?

• sinking of dense, cold water with high salinity
• the Coriolis force
• movement of a large mass of warm water across the Pacific
• sinking of cold freshwater from melting icebergs

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A large stream of moving water that flows through the oceans is called a(n)

• current
• tsunami
• tide
• undertow

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People obtain groundwater by drilling a well

• above the water table
• into an aquifer
• into the unsaturated zone
• into the impermeable layer

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

• large supply of nutrients
• think layer of mud
• lack of insects
• ability to prevent floods

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Most of Earth's freshwater is in the form of ____________.

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