ASTR 1101 Lecture Notes - Circumstellar Habitable Zone, Subduction, Runaway Greenhouse Effect
Document Summary
Earth- solid iron core surrounded by liquid iron core. We know this is true b/c of earthquakes. S waves- like riiples on the water- but doesn"t go through water. Earth: active atmosphere, weather, storms, clouds, solar energy- energy source, movements in water, tides, waves, solar energy. Tidal forces- energy source: geologically active, volcanos, plates, radio activity in the core-energy source. Last supercontinent: pangaea- 250 million years ago, earth has had more than one super continent, tectonic- 7-9 major plates, gillstone- a lava pit that is 4 states wide-ish. Earth has a supercontinent super cycle that last 500 million year- were about half way through the cycle. 250 million years - approx how long till the next super continent. Protoearth forms: ball of goo, crust cools first- produces a cap. Weak spots in the crust form volcanoes and start pumping out has as interior cools. Any hydrogen helium that was accreted is now released.
