by Nan Criqui
people know that Earth is moving around the Sun and
that it is constantly spinning. But did you know that
the continents and oceans are moving across the surface
of the planet? Volcanoes
and earthquakes as well as mountain ranges and islands
all are results of this movement.
Less than 100 years ago, many scientists thought the continents
always had been the same shape and in the same place.
A few scientists noted that the eastern coastline of
South America and the western coastline of Africa looked
as if they could fit together. Some also noted that,
with a little imagination, all the continents could
be joined together like giant puzzle pieces to create
one large continent surrounded by one huge ocean.
Click here to see where fossils
was known that lands now far apart and with very different
climates contained the same kinds of fossil plants and
animals. For example, certain
dinosaur fossils have been found across central
South America and western central Africa, and nowhere
else. Identical fossil plants have been found in southern
South America, southern Africa, India, Antarctica, and
Australia. Evidence of an ancient glacier that was once one large ice cap
can be found in South America, Africa, India, and Australia.
These areas would join if the present continents
were moved so that they fitted together into one whole.
But no one could explain how or why this movement might
Putting the Puzzle Together...