Alfred Wegener

• November 1, 1880 Berlin

• Noted for his continental drift theory

• He was a German scientist • He went to university of Berlin

• He trained as an astronomer

Continental Drift Theory

• The Continental Drift Theory is when thr earths plates move a Continent. They also found the same false in south America as they did in Africa.

Continental Drift Theory Evidence

• They also found the same fossil in south America as they did in Africa.

• The shapes of the continents fit together like a jig saw puzzle.

• The climate was the same when it was pangaea.

Harry Hess

• May 24, 1906

• Considered one of the founding father of the unifying theory

• He is best known for his theories on sea floor spreading.

• Hess entered Yale university

• August 25 , 1969

Sea Floor Spreading

• Sea Floor Spreading is when the sea floor is speeding because lava is commming from the core to the sea floor

Continental Drift Theory

• The Continental Drift Theory is when thr earths plates move a Continent. They also found the same false in south America as they did in Africa.

Sea Floor Spreading Evidence

• Lava is coming up from the center of the earth.

• The plates are moving.• The lava pushes the sea floor apart.

Other Definitions

• Subduction- the proces of witch the ocean floor sinks.

• Mid-Ocean Ridge-the longest chain of mountains in the world.

• Sonar-a device that bounces sound waves off underwater objects.