Fossil correlation - PowerPoint PPT Presentation

Fossils

Fossils. Evidence of ancient life. 4 categories of fossils :. 1. Original remains 2. Casts and molds 3. Replacement by minerals 4. Indirect evidence. 1. Original remains. Actual bones, teeth, or pollen grains Whole insects that were trapped in sap and hardened into amber

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Plate Tectonics

Plate Tectonics . Unit 2: Tectonic Processes Ms. Thind. Tectonic Forces. Earth’s crust subject to internal pressure and stress that originates within earth. Where are convection currents taking place? Asthenosphere (upper mantle) . Think back: What is the continental crust made of?

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227 views • 8 slides

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