Lecture 3 Water and Life

Lecture 3 Water and Life - Water and Life Water and Life...

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Unformatted text preview: Water and Life Water and Life How large is the earth? Radius: 3986 mi (4000 mi) Diameter: 7973 mi (8000 mi) Circumference: 25,048 mi (25,000 mi) 400 billion billion gallons 326 million mi 3 Volume of Water: Zircon Crystals Earliest Evidence of liquid Water on Earth Earths oldest terrestrial materials Western Australia, 2001 ~ 4.3 bya Pillow Lavas 3.5 bya Basaltic Extrusive Rock Earths Mantle Asteroids Comets Sources of Earths Water Setting the stage for the evolution of life Water is an essential precursor to life. Water and Life The most abundant substance in living systems % 70 Plants ~ 80% New born baby ~ 77% Grown man ~ 65% Grown woman ~ 58% The elderly ~ 50% A loss of just 5 percent of the body's total water will cause the mouth to go dry, the surface of the skin to shrink, and may even cause hallucinations A loss of more than 12 - 15 percent total body fluid would be fatal. The longest anyone has ever survived without water is _____ 15 percent of human water loss is through respiration 20 percent is lost through perspiration 65 percent is lost by excretion Average person has about 50 quarts of body water Water Loss 12 days Water and Life Water is an ideal medium for life processes. : 1. retains heat, moderates temperature 2. excellent solvent: transports nutrients, life compounds 4. Participates in biochemical reactions Water and Lifes Beginnings Water, Carbon, and Life...
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Lecture 3 Water and Life - Water and Life Water and Life...

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