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Introduction
Have you ever noticed how South America and Africa seem to fit together?
If you have, you aren't alone. Sir Francis Bacon first noticed this
peculiarity in the 17th century. Today, scientists believe that 200 million
years ago the Earth's continents were joined together to form one gigantic
supercontinent, called Pangaea. As the rock plates that the continents sit on moved, the
supercontinent broke up and began to move apart. This "continental drift"
is far from over! The Earth's surface is constantly moving and reforming,
but so slowly that you or I can't observe it ourselves. Only by taking very
small measurements over a long period of time can scientists tell
something is happening.
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Updated: January 22, 2003
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