Lecture 3 Water and Life

Lecture 3 Water and Life - Water and Life Water How large...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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 Earth’s oldest terrestrial materials Western Australia, 2001 ~ 4.3 bya
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Pillow Lavas 3.5 bya Basaltic Extrusive Rock Earth’s Mantle Asteroids Comets Sources of Earth’s Water Setting the stage for the evolution of life Water is an essential precursor to life.
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Water and Life’s Beginnings Water, Carbon, and Life
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/31/2011 for the course SOS 2007 taught by Professor Dr.jamesbonczek during the Summer '07 term at University of Florida.

Page1 / 11

Lecture 3 Water and Life - Water and Life Water How large...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online