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Based on early observations, including those in the
table below, scientists proposed that the continents
were once together but had drifted apart. However,
scientists could not identify anything that would make
them move. New technology, such as a worldwide
network of earthquake detectors, led to new
observations. Then scientists proposed that Earth's
surface was divided into tectonic plates that would
move as a result of forces linked to earthquakes and
the formation of new ocean floor.
Early Observations
Coastlines of Africa and South
America seem to fit together.
Similar fossils have been found in
both continents.
New Observations
Most earthquakes and volcanoes
occur along certain lines.
A mountainous ridge down the
center of the Atlantic Ocean
formed new ocean floor.
How are continental drift and plate tectonics related?
O Continental drift was the hypothesis that led to the
theory of plate tectonics.
O Continental drift was the theory that became the law
of plate tectonics.
O The theory of continental drift was modified based
on the new observations to become the theory of
plate tectonics.
O The theory of continental drift was proven false, and
the law of plate tectonics took its place.