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• Why does the North Pole move?
• Earth Day

More Great Links

• 101 Amazing Facts About the Earth
• Science Topics at USGS
• NASA Earth Observatory
• Climate Change at Exploratorium
• Windows to the Universe

Sources

• Britt, Robert Roy. "Moon Mechanics: What Really Makes Our World Go 'Round." Space.com, March 18, 2003.
  http://www.space.com/scienceastronomy/
  moon_mechanics_0303018.html
• Britt, Robert Roy. "When North Becomes South: New Clues to Earth's Magnetic Flip-Flops." Space.com, April 7, 2004.
  http://www.space.com/scienceastronomy/earth_poles_040407.html
• "The Carbon Cycle." NASA Earth Observatory.
  http://earthobservatory.nasa.gov/Library/CarbonCycle/
• Chown, Marcus. "Solar Wind to Shield Earth During Flip." New Scientist, May 15, 2004.
  http://www.newscientist.com/article.ns?id=dn4985
• "Cracking the Ice Age." NOVA Online.
  http://www.pbs.org/wgbh/nova/ice/
• "Earth's Atmosphere." NASA.
  http://liftoff.msfc.nasa.gov/academy/space/atmosphere.html
• "The Earth's Layers." North Dakota University System.
  http://volcano.und.nodak.edu/vwdocs/vwlessons
  /lessons/Earths_layers/Earths_layers1.html
• Glasner, Joanna. "Earth Hurtles Toward 6.5 Billion." Wired, February 21, 2006.
  http://www.wired.com/news/technology/0,70238-0.html?
  ­tw=wn_index_1
• "Global Warming and Our Changing Climate." United States EPA, April 2000.
• "Global Weather Patterns." BBC.
  http://www.bbc.co.uk/schools/gcsebitesize/geography
  /weather/elementsofweatherrev10.shtml
• Graham, Steve, et al. "The Water Cycle." NASA Earth Observatory.
  http://earthobservatory.nasa.gov/Library/Water/
• "The Great Ice Age." U.S. Geological Survey.
  http://pubs.usgs.gov/gip/ice_age/
• Hawkes, Nigel. "Waterworld: How will Life on Earth Look in 1000 Years." Times Online, February 17, 2006.
  http://www.timesonline.co.uk/article/0,,3-2044465,00.html
• Herring, David. "Ocean and Climate." NASA Earth Observatory.
  http://earthobservatory.nasa.gov/Library/OceanClimate/
• Illinois State Museum. "Why Are there Ice Ages?"
  http://www.museum.state.il.us/exhibits/
  ice_ages/why_4_cool_periods.html
• Larson, Josh. "Understanding Global Climate Patterns." USA Today, August 6, 2004.
• NASA Earth Observatory.
  http://earthobservatory.nasa.gov
• Seeds, Michael A. "Foundations of Astronomy." Wadsworth Publishing Company. 1994.
• Simkin, Tom, et al. "This Dynamic Planet." USGS. 1994.
• Smith, Lewis and Ben Hoyle. "World Has Only 20 Years to Stop Climate Disaster." Times Online, January 31, 2006.
  http://www.timesonline.co.uk/article/0,,2-2017322,00.html
• "Steam Explosions, Earthquakes, and Volcanic Eruptions - What's in Yellowstone's Future?" Fact Sheet 2005-3024, U.S. Geological Survey.
  http://pubs.usgs.gov/fs/2005/3024/
• Vastag, Brian. "North Magnetic Pole is Shifting Rapidly Toward Russia." National Geographic. December 15, 2005.
  http://news.nationalgeographic.com/news/
  2005/12/1215_051215_north_pole.html
• "What Is Photosynthesis?" Arizona State University, February 7, 2006.
  http://photoscience.la.asu.edu/photosyn/education/learn.html
• "Why Isn't the Earth Hot as an Oven?" NASA Earth Observatory.
  http://earthobservatory.nasa.gov/Library/Oven/