Create an account
A large, long valley on a continent; formed at a divergent boundary; small volcanoes are typical as magma rises and cools
the gradual movement and formation of continents (as described by plate tectonics)
a zone of semidesert that separates the Sahara from the savanna to the south - short, sparse, grass and very vulnerable
caused by black fly; results in blindness; causes people to move away from fertile river areas
Creation of African Countries
Arbitrary boundaries drawn by European colonial powers cutting across territories of different ethnic groups
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 and try again
Reload the page to try again!Reload
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