1. Battle for Posession of Earth’s Surface What dominates? Relief building: diastrophism & volcanism vs Degradation: weathering & erosion

2. Battle Lines

4. Geology provides the “kinetic energy”

5. Now - we focus on what interests geographer’s more: how Earth’s landforms differ from place to place by degradation

9. Equation is key to sustainability of where you live If relief building is winning (diastrophism > degradation), you are in danger! If degradation is winning (degradation > diastrophism), safe place to live.

10. If relief building is winning (diastrophism > degradation), you are in danger! Sign of danger: Soft rock is lifted high (and then landslides)

11. If degradation is winning (degradation > diastrophism), safe place to live. Sign of safety: mountains eroded

12. If degradation is winning (degradation > diastrophism), safe place to live. Sign of safety: hard rocks eroded to flat pediment

13. Answer this question Why are meteor impacts common on Mars and not on Earth? Even this small crater can be seen billions of years after it formed

14. Why are meteor impacts common on Mars and not on Earth? Meteor Crater, AZ 50,000 years ago Monturaquisole Impact Crater, Atacama Even in dry deserts, rims erode and depression fills in

15. Summary: view as a battle or working together?