Theory of Plate Tectonics Outline Notes
Theory of Plate Tectonics –

Continental Drift Theory –

In 1912


He named
His theory –
Pangea –
Drifting Continents –

Wegener supported his theory with evidence from:
1. Landform Evidence
2. Fossil Evidence
3. Climatic and Glacial Evidence
Scientists Reject Wegener’s Hypothesis

As compelling as this evidence was,

He could not
Marie Tharp and the Ocean Floor
 Oceanographer


Harry Hess and Seafloor Spreading
›
In the 1960’s,
›
Using new technology,
›
Harry Hess proposed the
Seafloor Spreading –





Seafloor Spreading –
Seafloor Spreading Evidence:
Molten Material –
Magnetic Stripes –
Evidence from Drilling Samples –
Key Idea –
Important Things to Remember –

Theory of sea floor spreading –

As distance from the ridge increases, the age of the sea-floor