NASA - National Aeronautics and Space Administration

North America is one of the seven continents. Image Credit: NASA

      one of the seven great divisions of land (as North America, South America, Europe, Asia, Africa, Australia or Antarctica) on the globe

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Sentences:
Astronauts can see the different continents from the space station.

The seven continents are North America, South America, Europe, Asia, Africa, Australia and Antarctica.

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More Information:
http://www.nasa.gov/worldbook/wbkids/k_earth.html
http://kids.earth.nasa.gov/archive/pangaea/   →
http://scign.jpl.nasa.gov/learn/plate.htm   →