The document discusses plate tectonics and evidence supporting continental drift. It notes that the solid earth is composed of three main layers - the crust, mantle, and core. The lithosphere is made up of the upper mantle and crust, while the asthenosphere below is squishier, hotter, and denser. Alfred Wegener originally proposed the continental drift hypothesis that all continents were once joined in a supercontinent called Pangea, supported by evidence like fossil matches, mountain ranges, and glacial deposits. His idea was initially rejected due to lack of a proposed mechanism, but has since gained support from discoveries of seafloor magnetism patterns, earthquake data, hot spots, and ocean drilling cores.

1. Plate Tectonics Daily Two Earth Science McLane High School

2. Plate Tectonics Daily Two 12/1,2 Objective: Recall basic information about the solid earth Q. What are the three main parts of the geosphere? A. Crust, Mantle, Core Q. Why is the solid earth layered? A. Density differences

3. Plate Tectonics Daily Two 12/3,4 Objective: Understand the evidence supporting continental drift What is the lithosphere composed of? Upper mantle + crust How is the asthenosphere different from the lithosphere? Squishy, Higher density, Hotter Crunchy Squishy

4. Plate Tectonics Daily Two 12/5,8 Objective: Understand the evidence supporting continental drift What types of evidence did Alfred Wegener use to support his Continental Drift hypothesis? Puzzle Fit Fossils Mountain Ranges Glaciers What is the continental drift hypothesis? The idea that the continents had once been joined to form a single supercontinent - Pangea

5. Plate Tectonics Daily Two, 12/9,10 Objective: Understand the historical perspective of the Continental Drift Hypothesis Why did the scientists in the early 1900s reject Wegener’s Continental Drift Hypothesis? What new evidence has been found to support Wegener’s ideas? Ocean Floor Magnetism Earthquake Data Hot Spots Ocean Drilling NoMechanism