Advertisement Upgrade to remove ads


a stream that flows into a large river or body of water

population density

the average number of people living in an area

ethnic group

a group of people who share the same ancestors, culture, language, or religion


the natives or first to live in the area

rain shadow

an area on the side of a mountain away from wind that recieves little rain fall

cultural exchange

a process in which different cultures share ideas or ways of doing things

cultural diversity

a wide variety of cultures


electric power produced by moving water, usually generated by releasing water from a dam across a river

transportation corridors

routes though which people can travel by foot, vehicle, rail, ship, or airplane


a number of cities and suburbs that blend into one very large urban area


the process of building new industries in an area dominated by farming; the devolpment of large indursties


a downturn in business activity and economic prosperty; not as servere as a depression


a person or group of people who want to seperate from their country or province or state


a cold, dry region covered with snow for more than half the year; a vast, treeless plain where the subsoil is always


land set aside for a specific purpose


a huge, slow-moving sheet of ice that fills valleys between mountains


the ways that goods and services are produced and made available by people

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording