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There are no animations for this chapter. See the additional resources below.

Additional Resources

The abundance of geology-related websites speaks to the active and exciting nature of this field. In the space below we link to external websites that explore topics covered in this chapter.

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	Greenhouse Effect 10/14/2004 Earthguide and the University of California
		This site offers an animated explanation of global warming and climate change

	Snowball Earth Animation 4/22/2005 Declan DePaor, ScienceProf.com
		The Snowball Earth Hypothesis proposes that during an ice age 900 mya, the entire land and oceanic surface the Earth was covered by ice. This animation shows four proposed stages to the formation and destruction of Snowball Earth conditions: During "normal" climate periods there are ice caps at the poles; sea level rises and falls. During "metastable" climate times ice sheets expand and contract dramatically. "Runaway snowball" conditions develop and ice nearly envelopes the Earth; atmospheric carbon dioxide is not absorbed by the frozen ocean. The rising concentration of unabsorbed carbon dioxide gas leads to a "runaway greenhouse effect"; Earth warms and the ice shell rapidly vanishes.