BIOL 2060 Lecture Notes - Lecture 3: Continental Crust, Jigsaw Puzzle, Biogeography
Document Summary
Biogeography: a branch of ecology that examines where species occur & what causes patterns of species distribution & richness. Historical biogeography: the study of how evolutionary lineages affect current & historic distributions of species & biotas (collections of species), paying particular attention to the roles played by speciation, extinction, & dispersal. Habital zone: sweet spot for liquid water. Earth gets warm, but not too warm. Planetary crust: 1 degree, 2 degree, & 3 degree (very rare) surface is returned to mantle. Tertiary crust; always being regenerated & consumed. Greenhouse effect: dynamic equillibrium co2 atmosphere versus erosion of continental silicate. Normal effect; without it we wouldn"t have an atmostphere keeps heat on earth from radiating back into space. Water bodies: freeze from top down coldest water on bottom. Max. density at 4 degrees celcius (heaviest); gets lighter below that temperature. An ice cube floats because it is colder that 4 degrees. Cold water has the highest oxygen content.
