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1) Sea Floor Magnetism
: Stripes of magnetic material in the seafloor provide strong evidence for tectonic theory. The stripes alternate between those with magnetic material orientated toward magnetic north, and those oriented in the opposite direction. By estimating when the flips occurred and pairing that with the distance the strips have moved from the spreading zone, scientists can estimate how fast the continents are moving.
2) Fossil Evidence
: Tropical species found in the Antarctic and similar fossils found in western Africa and eastern South America tell a story of where those land masses used to be. Paleomagnetic evidence is an even stronger piece of evidence. By constructing detailed records of changes in land mass orientation, scientists can reconstruct paths of tectonic movement much further back in history than they can from the magnetic striping on the sea floor.
3) Direct Measurement
: Modern technology gives us a range of ways to directly measure the movement of tectonic plates. These methods are based around the idea of measuring distance between two points on Earth by using some intermediary transmitter in space. Both SLR (Satellite Laser Ranging) and VLBI (Very Long Baseline Interferometry) allow for repeated measurements of distance between two points. As the continents move, the distances change. Using these measurements, scientists can accurately estimate movement of the tectonic plates today.

# data[].attributes.body
Oceanic-Continental

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Oceanic-Oceanic

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Continental-Continetal

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Sorry there was so much echo in the microphone, it didn't work out as it planned to. :(-- Created using PowToon -- Free sign up at http://www.powtoon.com/youtube/ -- Create animated videos and animated presentations for free.