Theory of Plate Tectonics

Written by: Abby Sullens And Molly Mauldin

Pangaea

Some scientists believe that all the continents were once connected to form one large land mass known as Pangaea. The Theory of Plate Tectonics is that the continents have separated over time.

Timeline

1. November 1, 1880- Alfred Wegener was born.

2.1904- Wegener received his doctoral degree.

3.1906- A Danish expedition invited Wegener to join as the chief meteorologist.

4.1912- Wegener proposed a theory that all of earths land was once combined to form a super-continent.

5. 1914- While Wegner was recovering from a World War I wound, he wrote a book about the theory of continental drift.

6. 1928- American Association of Petroleum Geologists invited Wegner to present his theory in New York.

7. 1930- Wegner returned to Greenland for his fourth visit. While there, he was caught in a blizzard and died.

Evidence

1. The shapes of the continents South America and Africa fit like a puzzle.

2. They found matching fossils of plants and animals along both coasts.

3. Mountain belts on both coasts match.

4. Evidence of ancient climates show that landmasses were once in different place.

5. Wegener believed Greenland was drifting farther away from Europe because his longitudinal location data didn't match earlier expeditions.

What We Think

We agree with the continental drift theory because the evidence is strong and logical. A weakness in this Theory is that the only example he used was South America and Africa. Our question is how long did the drift take to fully split the continents.
Plate Tectonics Explained