SCIENTIST

ALFRED WEGNER

• Alfred Wegner propsed the continetal drift in the early twetieth century
• 1912
• Evidence-he thought that continents were an only piece of land but they
• then they were seperated
• Alfred Wegner was not accepted into the scientific community

HARRY HESS

HARRY HESS

• In 1962 Harry Hess hypothonised that the sea floor was spreading
• Harry Hess was accepted
• Evidence-1963 geophysicits realized that Earths magnetic field
• Had reversed polarity many times, with each reversal lasting more than
• 200,000 years

ABRAHAM ORTELIUS

• Ortelius was the first person to see the shape of the coast
• Of South America and europe-africa in 1560
• Evidence-

CONTINENTAL DRIFT

• the gradual movement of the continents across the earth surface

MID OCEAN RIDGES

• A long seismically,active submarine ridge system situatdd in the middle
• Of the ocean basin and marking the site of the upwelling magma asscoiated with seafloor spreading

SEA FLOOR SPREADING

• The formation of new areas if oceanic crust, which occurs through the upwelling
• Of magma at midocean ridges and its subsequent outward movement on either
• side.

PANGEA