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Ice Ages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Visit www.worldofteaching.com For 100’s of free powerpoints
First Glaciation in Antarctica 15 M.Y. Dwarf forests still in Antarctica 4000 (4 M.Y.) Beginning of Pleistocene 2000 (2 M.Y.) About 20 Glacial Advances 600-2000 Donau I 585-600 Tiglian 550-585 Weybourne Donau II 540-550 Waalian 470-540 Menapian Gunz "Nebraskan " 330-470 Likhvin Cromer   Aftonian 300-330 Jaroslavian Elster Mindel Kansan 230-300 Sandomirian Holstein Hoetting Yarmouth 180-230 Cracovian Warthe/Saale Riss Illinoisan 128-180 Masovian Eem Uznach Sangamon 67-128 Varsovian Vistula Wurm Wisconsin 18-67 Interglacial 0-18 Poland-Russia Northern Europe Alps North America Time (1000 Years)
The Last 800,000 years
Beginning of the Ice Ages
Milankovich Cycles ,[object Object],[object Object],[object Object],[object Object],[object Object]
Axis Tilt ,[object Object],[object Object]
Axis Tilt and the Incredible Shrinking Tropics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Precession: 26,000 year cycle
Shape of Orbit + Precession ,[object Object],[object Object],[object Object],[object Object],[object Object]
The Greenhouse Effect ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Carbonate-Silicate Cycle ,[object Object],[object Object],[object Object],[object Object]
The Carbonate-Silicate Cycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Carbonate-Silicate Cycle ,[object Object],[object Object],[object Object],[object Object]
The Snowball Earth ,[object Object],[object Object],[object Object],[object Object],[object Object]
The Snowball Earth ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What Causes Ice Ages? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Are We Headed For Another Ice Age? ,[object Object],[object Object],[object Object],[object Object]

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Iceages

  • 1.
  • 2. First Glaciation in Antarctica 15 M.Y. Dwarf forests still in Antarctica 4000 (4 M.Y.) Beginning of Pleistocene 2000 (2 M.Y.) About 20 Glacial Advances 600-2000 Donau I 585-600 Tiglian 550-585 Weybourne Donau II 540-550 Waalian 470-540 Menapian Gunz "Nebraskan " 330-470 Likhvin Cromer   Aftonian 300-330 Jaroslavian Elster Mindel Kansan 230-300 Sandomirian Holstein Hoetting Yarmouth 180-230 Cracovian Warthe/Saale Riss Illinoisan 128-180 Masovian Eem Uznach Sangamon 67-128 Varsovian Vistula Wurm Wisconsin 18-67 Interglacial 0-18 Poland-Russia Northern Europe Alps North America Time (1000 Years)
  • 4. Beginning of the Ice Ages
  • 5.
  • 6.
  • 7.
  • 8. Precession: 26,000 year cycle
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  • 17.