GEOG 101 Lecture Notes - Lecture 7: Sea Level, Northern Hemisphere, Soil
27 Oct 2016
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Water: polar water ice in mars. Ice in the moons of jupiter (europa and calypso: water on earth 71% of the planet, properties colorless, odorless, tasteless. It is a solvent (pure water rarely occurs in nature) Water on earth: hydrosphere, origin in planetesimals, including comets, outgassing water (cid:272)o(cid:373)i(cid:374)g fro(cid:373) u(cid:374)der(cid:374)eath earth"s (cid:272)rust 25 k(cid:373) deep, worldwide equilibrium . Eustasy changes in the volume of water within the ocean without affecting total water contained in earth. Water bound up in glaciers or melt out from them. Glacier times 18-40000 years ago v. warm times such as today: distri(cid:271)utio(cid:374) of earth"s water today, less than (cid:1007)% of the earth"s water is fresh water (cid:894)(cid:1006). (cid:1011)(cid:1012)%(cid:895); (cid:1013)(cid:1011). (cid:1006)(cid:1006)% is in the ocean as salt water. 77. 78% of fresh water on earth is surface water; the rest consists of soil moisture, groundwater, and deep groundwater: water dominates the southern hemisphere, while land dominates the northern. Hemisphere: salty lakes inland, no outlet to the ocean.
