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Alfred Wegener & Harry Hess's Impact on Plate Tectonic Theor
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Alfred Wenger Biographical Information :)
Harry Hess's Theory on Sea Floor Spreading
Alfred Wenger Theory on Continental Drift
Born on November 1, 1880 in Berlin.
He earned a PhD in astronomy from the University of Berlin in 1904.
In 1906 he took part in an expedition to Greenland where he studied polar air circulation.
He was drafted in the German army in 1914.
In 1911 Alfred found papers listing animal similar fossils found on different sides on opposite sides of the Atlantic.
He died in 1930 of a heart failure because he smoked.
He used geological evidence to support his theory that Africa and South America were at one time one place. He used maps, rock formations, and fossil to prove that South America was once connected to Africa.
Alfred was one of first scientists to look and see that the continents fit together by their shores.
He saw that grounds of mountains and valleys don't make normal patterns.
He observed the movement of the magnetic poles. The poles moved on the path of the continents .
Hess theorized that the ocean floor is only a few hundred million years old.
Molten rock comes up from volcanically active mid-ocean ridges. Than it spread sideways and it makes a new seafloor.
Than the old sediment disappears back into the Earth’s deep interior.
Work Cited
1. http://pubs.usgs.gov/gip/dynamic/HHH.html
2. http://www.amnh.org/education/resources/rfl/web/essaybooks/earth/p_hess.html
3. http://www.ucmp.berkeley.edu/history/wegener.html
4. http://earthobservatory.nasa.gov/Features/Wegener/
5. http://www.pbs.org/wgbh/aso/databank/entries/do12we.html
Alfred Wenger Theory on Continental Drift Cont.
He found that the rock strata of the Karroo system of South Africa were the same rock type as the Santa Catarina system in Brazil.
He also found striae left by glaciers over the land surface, proving that Africa and South America had been connected when the ice age was taking place.
He saw that mountain ranges formed as narrow bands at the edge of continents. He concluded these formed when the edges of drifting continents broke and folded over when they hit the other continents for example the Himalayas, formed when India collided with Asia.
Harry Hess Biographical Information
He was born in 1906.
Harry was a Captain in the Navy.
He was professor of geology at Princeton University.
Hess helped design the national space program
He died in August, 1969, a month after Apollo 11’s successful mission. It was very exciting that he got to see the Apollo mission since he was an important member of the national scientific community.