United States Practice

A small river that feeds into a larger river is called ______.

• headwater
• divide
• estruary
• tributary

The direction that rivers flow toward the ocean changes at the ......

• Prime Meridian
• Continental Divide
• Grand Canyon
• Great Plains

The source of a river or stream is called a ______.

• headwater
• divide
• estruary
• tributary

The Atlantic and Gulf Coast regions of the United States deal with large, powerful storms that form over oceans, also known as _____.

• hurricanes
• tornadoes
• typhoons
• tsunamis

A type of warm, dry wind that occurs on the downward slope of a mountain.

• eutrophication
• acid rain
• chinook
• overfishing

Precipitation that carries dissolved acid that results from excessive air pollution.

• eutrophication
• acid rain
• chinook
• overfishing

A structure that carries water from a source to a destination.

• bridge
• dam
• canal
• aqueduct

Removal of all trees in an area to harvest timber.

• chinook
• aquaculture
• timberline
• clear-cutting

The line or altitude above which no trees grow.

• chinook
• aquaculture
• timberline
• clear-cutting

A large population center created by the sprawl of several large cities.

• metropolis
• megalopolis
• megaclusters
• megacities