Key Understandings:
- Bedrock geology
- Absolute dating
- Half-life (ex. halflife of Carbon-14 is 5,700 years)
- Relative dating
- Law of Superposition: Oldest rocks are on bottom.
- Law of Cross-Cutting Relationships: Rock must exist before it can be cut by a fault.
- Law of Igneous Intrusions: Rock has to exist before magma can flow through it.
- Rock record/fossils
- Evolution of life
- Geologic Time: Divided based on fossil evidence
- Precambrian eon: 90% of Earth’s history, had very little life
- Extinction of Dinosaurs: Meteor impact and global cooling 65 mya
- Humans: Have only existed for a “blip” of time
- Earth is 4.6 Billion Years Old