EESC1180 Lecture Notes - Lecture 2: Asthenosphere, Boron Group, Continental Crust
19 Sep 2017
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Solar system starts as dust and gasses (nebula) and then starts to gravitationally collapse. Nebula contracts into a flattened rotating disk that is heated by gravitational energy turning into thermal energy. As it formed the decay of radioactive elements and heat from high velocity impacts increase temp. Iron and nick melt and sink to center. Gaseous material escapes earth"s interior to produce the primitive atmosphere. Ocean is 71% of earth"s surface and 97 percent of all water. Moisture in atmosphere and in equal heating of the earth as hot air rises cools, spreads out and becomes rain creates oceans. Hydrosphere is all the water on the earth - mostly salty. 69% of earth"s freshwater is a glacier. Any size group of interacting parts that form a complex whole. Bolides: meteorites asteroids comments, impact earth by imparting energy and material to our planet. Drives internal processes like earthquakes, volcanoes and mountain.
