theories of geological evolution. first stop catastrophism how is it possible to explain the world...
TRANSCRIPT
Theories of Geological Evolution
First Stop
CatastrophismHow is it possible to explain the worldaround you, without science?
Until the 1700s, most Europeans thought that a Biblical Flood played a major role in shaping the Earth's surface.
Catastrophism – the theory that Earth’s features are
mostly accounted for by violent, large- scale events that occurred in a
relatively short amount of time.
Second Stop
UniformitarianismIn the 1785 a new theorywas proposed by James Hutton, called Uniformitarianism.Charles Lyell expanded on this theory and wrote “Principals of Geology.”
Uniformitarianism – the theory that Earth’s features are mostly accounted for by
gradual, small-scale processes that occurred over long periods of time.
“The present is th
e key to th
e past.”
Notes1st theory – Catastrophism Earth shaped by catastrophes
2nd theory – UniformitarianismEarth shaped gradually by constant geologic processes
3rd theory – Continental DriftContinents were once connected and then drifted apart
4th theory – Plate Tectonics Convection seafloor spreading push and pull of
Earth’s plates
The Rise and Fall of a theory…and how it was saved changed.
Using 4 lines of evidence, Wegener was able to identify that the
continents were onceassembled asPangaea.
Third Stop
Continental Drift
NAME the Evidence
Fourth Stop ---- Final Stop
Plate Tectonics Solving the mystery of Drifting
Continents.
Harry Hess
With the person next to you:
1. Review your guided notes and list all of the evidences used in the theory of plate tectonics.
2. Draw a model of seafloor spreading and include the following aspects
◦ Mid-ocean ridge (MOR)◦ 2 lithospheric plates, include your crusts◦ 2 Convection Currents