Geos 212 Lecture 1 08 29 2014 Earth Surface area 70 ocean 30 land Volume 0 1 ocean 99 9 land Oceans thin layer 4km deep 4000km wide mostly deep except shelf 100m deep Liveable space in the ocean is 99 ocean 1 land Nothing lives in the air everything needs liquid water to survive Latitude parallels the equator Longitude run from pole to pole top to bottom Geos 212 Lecture 1 8 29 14 What makes the Earth special LIQUID WATER life only found on earth every living organism on earth must have liquid water in some form in order to survive every living cell is composed primarily of water need liquid water on surface of planet for life to exist Habitable Zone temperature for liquid water Cant be too hot nor too cold depends how far out you are from sun Mars too cold Venus too hot Earth between the two perf temp Habitable planet Needs Liquid water Not too hot not too cold Not too much gravitational pull not too little Plate motion volcanoes co2 plants Earth is the suns habitable zone Geos 212 Lecture 1 8 29 14 PANGEA 200 million years ago all the continents were one this is how we see plate tectonics on earth time scale did they move slow steady or happened in episodes starts stops Ways we see plate tectonics on human time scale Earthquakes o Northridge 1994 M 6 7 Volcanoes o Mount Saint Helens 1980 Tsunamis o Japan Tsunami 2011 M 9 0 Plates are moving