OCS 1005 Chapter : Chapter One And Three
15 Mar 2019
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Document Summary
Big bang: as the universe expanded (caused by explosion), it cooled, eventually allowing the formation od atoms, which formed galaxies and stars. Beginning of universe probably 14 billion years ago (believed to be only one point) Scientists believe our solar system was formed about 4. 6 billion years ago. Something that is small but heavy has a high density. Something that is light for its size has a low density. Things that have high density sink, while things with low density float. Outgassing- gasses in earth"s core released by volcanic explosions. 3. 8 billion years ago earth was frequently hit by asteroids and meteors. Heat of earth"s core is due to radioactive decay. Subsidence- something going down to center of the earth. Uplift- something being pushed upward from the center of the. History of plate tectonics: -continental drift: proposed in 1915 by alfred wegener. Found mountains in south america and africa that had been connected.
