theories of geological evolution

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Theories of Geological Evolution. How is it possible to explain the world around you, without science? Until the 1700s, most Europeans thought that a Biblical Flood played a major role in shaping the Earth's surface. - PowerPoint PPT Presentation

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Theories of Geological Evolution

First StopCatastrophism

How 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 Earths features are mostly accounted for by violent, large-scale events that occurred in a relatively short amount of time.

Second StopUniformitarianismIn 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 Earths features are mostly accounted for by gradual, small-scale processes that occurred over long periods of time.

The present is the key to the 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 Earths plates

The Rise and Fall of a theoryand how it was saved changed.

Using 4 lines of evidence, Wegener was able to identify that the continents were onceassembled asPangaea. Third StopContinental Drift

NAME the Evidence

Fourth Stop ---- Final StopPlate Tectonics

Solving the mystery of Drifting Continents.

Harry Hess

With the person next to you:

Review your guided notes and list all of the evidences used in the theory of plate tectonics.

Draw a model of seafloor spreading and include the following aspectsMid-ocean ridge (MOR)2 lithospheric plates, include your crusts2 Convection Currents

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