Wednesday 11/14/18

Today we continued our discussion on how earth's plate help to create land forms.  We learned that Alfred Wegener proposed the theory of continental drift.  We learned that Wegener used a C.E.R. for his theory.

Claim - Continents over time drift

Evidence - 1. Shapes of continents - See South America and African coastlines.
                  2. Fossils found on South American and African coastlines are at the same
                     depth and could only have come from a time when both are near each
                     other at one time.
                  3. Strata layer are the same from both South America and Africa. They have
                      the same types of rock, same types of index fossils and same depth size.   
Reason -   Continents at on time were all together in on super continent call Pangaea.

The problem was that scientists at the time did not believed that there was a force that was strong enough to move continents.

We then moved on to the idea of sea floor spreading.  We looked at how we now have evidence that earth's plates are moving and it wasn't until the 60's that prove was found in the rocks because of earth's magnetic field.