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Arches National Park Geology Tour provides an extensive, visually rich description of the geology of Arches, by Deborah Ragland, Ph.D. See our DVD collection.
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NASA

The Cooling of Earth

Planets cool off for many different reasons.

When Earth formed about 4 Billion Years ago, it became relatively large and warm. Earth also contains many warming elements such as the radioactive minerals, so it has not cooled as rapidly as some other planets.

Earth has had a long a complicated cooling history. An understanding of the Earth's history might begin with the record of geologic time.


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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA