Earth Sciences 1022A/B Chapter Notes - Chapter 1: Mantle Convection, Nebular Hypothesis, William Edmond Logan

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We have a natural human curiosity, to better protect our us? environment. Food, clean water, energy, resources to provide necessities. Rates of these processes have changed overtime. The present is the key to the past . The assumption that the same natural laws and processes that operate in the universe now, have always operated in the universe in the pass. Measures earth history in billions of years. Planet has been around for 4. 5 billion years. Amount of time to erode high mountain ranges. What is the of hydrogen and helium nebular contracted under hypothesis? gravity into the flat disc. Collisions of rocky materials, gathered together to form earth. Particles were pulled in, and others migrated outwards. Lighter elements formed crust, heavy elements (iron, Crust and uppermost mantle formed rigid plates of different layers. Lithosphere (rock) that ride on the of the earth. Alfred wegener meteorologist the idea of the. Fit of the continents; south the large land.

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