1. Geology 150 Earth Revealed Introduction

2. Evolution of the Earth Big Bang – 15 b.y. Solar Nebula Cooling and Condensation of tiny particles Repeat collisions Accretion into planets

3. Our Solar System Composed of Sun, 9 planets, asteroids, comets, and moons –Sun is at the center –Inner planets  Terrestrial (rocky) –Outer planets  Jovian (gas) (1) Mercury, (2) Venus, (3) Earth, (4) Mars (1) Jupiter, (2) Saturn, (3) Uranus, (4) Neptune –Outermost planet Pluto

4. Earth

5. What is Geology? The science that seeks to understand planet Earth

6. Earth’s system Group of interacting parts that form a complex whole Hydrologic Cycle Rock Cycle

7. Earth’s Spheres Biosphere –All living organisms and their habitats Hydrosphere –H 2 O in oceans, rivers, lakes, ice, groundwater Atmosphere –Gaseous envelope surrounding Earth Geosphere –Solid Earth

8. Geology I.Physical Geology –Materials that compose the Earth and the processes that operate beneath and on its surface II.Historical Geology –The origin of Earth and its development over time

9. History of Geology Catastrophism –Earth’s landscape had been shaped by great catastrophes

10. Modern Ripples History of Geology “The present is the key to the past” Uniformitarianism –Geologic processes operating today, operated in past Fossilized Ripples Modern Mudcracks Fossilized Mudcracks

11. People and Geology Natural Hazards –Natural processes that become hazards when people live where they occur

12. Natural Hazards Earthquakes

13. Natural Hazards Volcanoes Nevado del Ruiz, Columbia, 1985; 25,000+ perished

14. Natural Hazards Volcanoes Weed, California; Mount Shasta

15. Natural Hazards Landslides La Conchita, California 19952005

16. Natural Hazards Floods

17. Natural Hazards Tsunamis