29 - CRISES OF A PLANET 8/29 Solar system is expanding...

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CRISES OF A PLANET -- 8/29 Solar system is expanding today -- FALSE The early earth's atmosphere is mostly made of carbon dioxide, hydrogen sulfide and water Most of the craters on the earth's moon date back to 4.0 or more billion years Relative to the age of the arth, the fraction of time that humans have existed is .08% PLATE TECTONICS AND EARTHQUAKES How Earth is unique: - Life - Internal Heat -- U, Th, K - Size (enough gravity to hold atmosphere) - Differentiated -- core, mantle, crust - Atmosphere (with water, gives us oxygen, filter for meteorites, - Lithosphere (outer part of the earth) -- moving because the mantle of the earth is churning - Asthenosphere Continental Drift - Afred Wegener 1915 Gondwanaland -- rejected for a lack of mechanism Sea Floor Spreading -- Harold Hess - 1960 - found that the ocean floor. rocks. are nothing like on land, very different - ocean floor geology (oceanography) - ocean rocks are made out of basalt - - mid ocean ridges - thin crust 7-10 km - symetrical ages - all crust < 200 million years
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