9.1 Continental Drift An Idea Before Its Time

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Presentation transcript:

9.1 Continental Drift An Idea Before Its Time  Wegener’s continental drift hypothesis - continents had once been joined in a single supercontinent, Pangaea. • Wegener: Pangaea began to break apart 200 million years ago and form the present landmasses.

Breakup of Pangaea

9.1 Continental Drift Three kinds of evidence in support of Continental Drift theory Matching fossils Similar mountain ranges and rock types Similar climates

9.1 Continental Drift An Idea Before Its Time Evidence for Continental Drift 9.1 Continental Drift 1. Matching Fossils - Fossil evidence (Mesosaurus) includes same fossil organisms found on Africa and South America

9.1 Continental Drift An Idea Before Its Time  Evidence for continental drift 2. Rock Types and Structures - Several mountain belts end at one coastline, only to reappear on a landmass across the ocean.

Matching Mountain Ranges

Glacier Evidence Evidence 3. Similar ancient climate Remnants of glaciers have been found in India, South America that match glaciers in Antarctica

9.1 Continental Drift Rejecting the Wegener’s Hypothesis  A New Theory Emerges • Wegener could not provide an explanation of the mechanism. New technology led to findings & new theory called plate tectonics. Tectonic plates move up to ½ inch a year.

Create a timeline Do with actual distances Pay attention this can be confusing! You will need a 2 whale Biology book and turn to page 374

Creating a timeline Your paper will be one meter long The one meter long paper will represent the time of earths life(one end will be the beginning of time the other end will be modern day) Using the timeline from the book you will make an accurate timeline of earth.

Creating a timeline Example Earth 4,300,000,000 years old First dinosaurs 225,000,000 Sheet of paper is 1 meter long(represents age of Earth) 225,000,000/4,300,000,000=0.052.This means that dinosaurs showed up 5.2% of the time since earth has been around 5.2% of 1 meter is 5.2 centimeters from modern day

Time Line Draw and label the following major events with pictures Precambrian, Paleozoic, Mesozoic, Cenozoic eras Pangaea begins to break apart First Vertebrates First amphibians First reptiles First mammals First Dinosaurs Humans evolve