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Copy of Copy of Mechanism of Movement
Transcript of Copy of Copy of Mechanism of Movement
In the end, we now know what caused the continents to drift apart. We found the missing piece of evidence Wegener could not. It was because of convection which caused Sea-Floor Spreading to happen. Which then created the Mid-Atlantic ridge that pushed part the continents. Which made it seem like they drifted apart.
The Geosphere 03:
Mechanism of Movement
Alfred Wegener came up with the theory that all continents were once joined in a landmass he named Pangea. (Greek for All Earth) Then the continents split up and drifted to where they are today.
Evidence Piece 1
Continental Shapes - The coastlines of the continents look like they can fit together like a jigsaw puzzle
Evidence Piece 2
Land Animal - Cynogthus and Lystrosaurus fossil remains were found in South America, Africa, India and Antarctica. Both animals lived on land and could not have crossed the ocean.
Evidence Piece 3
Water Animal - Mesosaurus fossils were found in Souther Africa and south South America. It was a fresh water animal and could not have been able to cross the ocean because it's salty.
Evidence Piece 4
Glossopteris fossil remains were found on South America, Africa, India, Australia, and Antarctica. It only grew in warm climates unlike Antarctica.
Evidence Piece 5
Rocks (mountains) - The rocks that make up the Appalachian Mountains are found on 2 continents. The East coast of North America and in Scandanavia (Europe). If joined they create a continuous mountain chain of the same rock and age.
Evidence Piece 6
Climate Evidence - North America, Parts of Europe and Asia were once tropical. Glaciers were found in Central Africa and other locations that are currently near the equator. Evidence of Warm and Cold climates are found in locations that don't have the same climate today.
The Missing Evidence
The missing evidence was the force that caused the continents to drift. Wegener could never figure it out and his theory was rejected by other scientists because of this. It wasn't til after his death it was found. It was Sea-Floor Spreading. Scientists always thought the sea floor was flat until they found the Mid-Atlantic Ridge. The M.A.R. is a mountain chain in the atlantic ocean. And Sea-Floor Spreading is what created it.
Outer-most layer of Earth. Thinnest layer of Earth. 5-100 KM Thick. Made of Oxygen, Silicon, and Aluminum.
2 Types of Crust: Continental and Oceanic
Layer of the Earth between the Crust and the Core. Much thicker than crust and is most of Earth's Mass. Denser than the Crust.
Inner-most part of the Earth. Center of the Earth. Mostly made of Iron. Makes up one-third of Earth's Mass.
Oceanic and Continental Crust
Oceanic Crust - Sea-Floor. More dense than continental crust. Almost twice as much iron. calcium, and magnesium. So it is thinner but more dense.
Continental Crust - Thicker but less dense than Oceanic Crust and it's the land.
Outer-most. rigid layer of Earth. Made of 2 parts, the crust and the rigid upper part of the mantle. Divided into pieces called Tectonic Plates. Will break under pressure.
Plastic Layer of the mantle on which pieces of the lithosphere move. Made of solid rock that can flow slowly like plastic
Convection - The process that created the Mid-Atlantic Ridge. The core heats up the mantle. When heated the magma from the Asthenosphere expands. When it expands it becomes less dense and it rised up. It pushed new land to come up and form. And it keeps doing so it pushes the old land it already created away from the center. When the magma loses heat it becomes cold. Then it becomes more dense and sinks back to the bottom only to start again.
Earth-Space Science FLVS