Download
slide1 n.
Skip this Video
Loading SlideShow in 5 Seconds..
EARTH ORIGIN PowerPoint Presentation
Download Presentation
EARTH ORIGIN

EARTH ORIGIN

84 Views Download Presentation
Download Presentation

EARTH ORIGIN

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. S EARTH ORIGIN

  2. P % of Earth’s History * 78.0% 43.0% 9.3% 8.0% 3.8% 0.1%

  3. S Order of Planets from the Sun Sizes are Relative Distances are not Accurate

  4. S Order of Planets from the Sun Sizes are Relative Distances are not Accurate

  5. S Milky Way Galaxy

  6. S TIME-LAPSE VIDEO OFNIGHT SKY IN NAMIBIAhttp://www.youtube.com/watch?v=EM5lM5WEY3Q

  7. S

  8. S

  9. S

  10. S

  11. P http://www.youtube.com/watch?v=oAVjF_7ensg

  12. S Decay Products of U235

  13. P Half-life = the time it takes for half of the parent to decay into the daughter

  14. S

  15. P Long half-life Slow Processes Short half-life Fast Processes

  16. P Earth’s Atmosphere Changes

  17. S Life on Earth • Earliest known evidence of life was about 3.6 billion years ago • Early life may have started in the intertidal zone or at black smokers

  18. S Intertidal Algae

  19. S

  20. P Life on Earth • Evidence suggest the composition of seawater has changed little over the last 600 million years • Mass extinctions have occured over time. Why?

  21. S

  22. S

  23. S Moon Craters

  24. S Impact Craters in Canada

  25. S Most impact craters would be in the oceans

  26. P 7/18/94 19:35 GMT +7 min + 16 min

  27. S

  28. P Life on Earth • Impacts from extraterrestrial bodies • the latest big one was at the K/T boundary about 66 million years ago • it corresponds with the extinction of the dinosaurs • in 1991 bull’s eye pattern of gravity variations was detected off northern Yucatan (Chicxulub) • the circle was 180 km in diameter

  29. P Life on Earth • other more recent events include: • Winslow, Arizona about 50,000 years ago leaving a crater 4,000’ wide and 750’ deep - caused by an object 135’ in diameter traveling at 12 miles a second with an explosive force of 15 megatons • Tunguska, Siberia - 1908 - no crater, extensive damage, 10 megatons, site not visited for 20 years

  30. S Meteorite Crater near Winslow, Arizona