Hydrology Unit Review

Why is MOST of the freshwater on Earth not available for our use?

• All freshwater on Earth is easily accessible for use.
• It is frozen in the icecaps and glaciers.
• It is surface water.
• It is underground.

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What is a watershed?

• Water in an area
• Water that flows into a river or stream
• Land that water flows over and through
• Water that is salty

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The graph shows the distribution of the freshwater resources of Earth. Which of these sources of fresh water corresponds to Source 1?

• atmospheric water

• surface water

• frozen water

• groundwater

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Which best describes the characteristics of a river basin?

• the land drained by a river and its tributaries

• the land formed when rivers create estuaries and marshes

• the land at the mouth of a river where water flows into the ocean

• the land formed as a result of a river flooding

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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

Which will most likely result if there is increased upwelling in a coastal area?

• more aquatic life

• less nutrients in the water

• higher water temperatures

• fewer nitrates

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In which location would fishermen most likely catch a greater number of fish?

• at the shoreline

• in an upwelling

• in the intertidal zone

• on the deep-ocean floor

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Which is the main source of dissolved oxygen in the ocean?

• underwater earthquakes

• decay of living organisms

• animals that live near the surface

• plants and algae that live near the surface

Which organism is at the base of a marine food web?

• crab

• phytoplankton

• whale

• zooplankton

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Which best describes the relationship between salinity levels and the amount of dissolved gases in ocean water?

• As salinity increases, the amount of dissolved gases increases.

• As salinity increases, the amount of dissolved gases decreases.

• As salinity decreases, the amount of dissolved gases decreases.

• As salinity decreases, the amount of dissolved gases remains the same.