ERTH 2403 Lecture 1: jan12
15 Aug 2015
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Other thoughts on origins of biosphere : extra-terrestrial (comets and asteroids, hydrothermal vents, deep ocean water, not photosynthetic, chemosynthetic base (sulphur fixing base) Major earth systems ocean = saline water occupying depressions on earth"s surface. More than 97% earth"s water less than 3% in land ice, groundwater, and all freshwater lakes and rivers traditionally divided into artificial compartments (oceans and seas) average depth = 3682 metres average temperature = 3. 9 celcius. Voyaging for trade and exploration early peoples for economic reasons (polynesians, egyptians, etc) curiosity exploration. Neolithic (bone fish hooks) by 5005 bc (wire fish hooks: historical evidence library of alexandria. Polynesians colonization of polynesia (central and eastern pacific) knowledge of sea required colonized ~10000 islands. New guinea and phillippines 6000 years ago cradle settled between 1000 and 900 bc. Why risk voyages? religious warfare = colonization hope for survival = reach distant land long distance discovery fine new home and escape volcanoes.
