Geology 150 Earth Revealed Introduction. Evolution of the Earth Big Bang – 15 b.y. Solar Nebula Cooling and Condensation of tiny particles Repeat collisions.

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Presentation transcript:

Geology 150 Earth Revealed Introduction

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

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

Earth

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

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

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

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

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

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

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

Natural Hazards Earthquakes

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

Natural Hazards Volcanoes Weed, California; Mount Shasta

Natural Hazards Landslides La Conchita, California

Natural Hazards Floods

Natural Hazards Tsunamis