Our Earth.  What do you think the earth looked like long ago?

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Presentation transcript:

Our Earth

 What do you think the earth looked like long ago?

 Do you think the map looked exactly the same?

 Could the continents have been closer together?

 Alfred Wegener  A scientist who believed the continents used to be close together.  He studied the world map and noticed that the continents could fit together like puzzle pieces.

 Theory of Continental Drift  Wegener’s belief that the continents move.

 Pangaea  1 supercontinent  All the landmasses combined  About 250 million years ago

 What was the evidence for Pangaea?  Geologic  Fossils  Glacial

 Geological  Similar rocks and mountains found on the coast of Southwest Africa and Eastern South America.

  Fossils are the remains from once living things.  The same fossils were found on the coasts of continents that fit together. Fossils

 Glacial  Glacial deposits (sediments) are found on continents that could have fit together.

 Critics  Many scientists did not believe Wegener because he couldn’t explain what force moved continents.

  Between the 1950s-1960s, the Theory of Plate Tectonics was developed. This theory stated that continents are part of moving tectonic plates. Evidence of seafloor spreading helped prove this. Theory of Plate Tectonics

 Tectonic Plates  Pieces of earth’s crust  Found on the lithosphere.  2 types:  a.)oceanic  b.)continental

 Seafloor Spreading  The widening of the ocean.  New oceanic crust is formed through volcanic activity.

 Pangaea Song