OCNG 251 Lecture 2: OCNG Chapter 1 intro to planet Earth lect 2
25 Jan 2017
School
Department
Course
Professor
Document Summary
Pacific: largest- covers 1/3 earth surface. Can easily fit all continents: deepest- mean depth is 3940 m, deepest point in all oceans- mariana trench. Atlantic: 2nd largest, half size of pacific. Indian: southern hemisphere, south of equator, below 0 latitude, mean depth= 3840 m. Arctic: smallest- 7% size of pacific, shallow as deep as other oceans. Mean depth= 1117 m: permanent layer of ice. Southern: defined by meeting currents called antarctic convergence, band around antarctica, parts of pacific, atlantic, indian oceans south of 50 degree south latitude, unique chemistry and biogeography. Elevation changes are more extreme than on land. Deepest part of trench is called the challenger deep: depth of 10,994 meters. Trieste- submarine that first made it down there in 1960 with: Everest: everest is 8850 m, trench is 11,022 m. It only applies to the horizontal, from west to east. Polynesia islands occupied as early as 1100 bce. Used movements of stars and seasonal winds to navigate.
