See photographs and video assocated with geological processes in Texas Tides: 

	Clouds: a step in the water cycle
	Cenotes: how do they form?

Related Links:
Earth System, Structure and Processes (Teachers' Domain (free registration required))
Exploratorium: the museum of science, art and human perception.
EekoWorld by PBS Kids
EurekAlert! from the American Association for the Advancement of Science
LearnNPS from the National Park Service
Smithsonian Science and Nature
Texas Parks and Wildlife outdoor learning

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