continents

Dictionary of Cultural Literacy: Science:

continents

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The large parts of the surface of the Earth that rise above sea level. The seven major continents are Africa, Antarctica, Asia, Australia, Europe, North America, and South America.

Continents are made from the lightest rocks in the Earth. Some of these are also the oldest known rocks on Earth, with an age of 3.5 billion years, measured by radioactive dating.

According to the theory of plate tectonics, continents move along piggy-back on the tectonic plates like rafts floating on water.

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Dictionary of Cultural Literacy: Science The New Dictionary of Cultural Literacy, Third Edition Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin. All rights reserved. Read