Mount St. Helens Erupting, May 18, 1980
Photograph
By: Austin Post
Date: May 18, 1980
Source: Post, Austin. Mount St. Helens Erupting, May 18, 1980 . Cascades Volcano Observatory, U.S. Geological Survey. Available online at http://vulcan.wr.usgs.gov/Volcanoes/MSH/Images/may18_images... ; website home page: http://vulcan.wr.usgs.gov/home.html (accessed May 22, 2003).
Introduction
Conventional wisdom identifies the Sun as the source of heat in our solar system. This belief has much truth, but it is incomplete. Earth has its own heat source. Eighteen hundred miles beneath Earth's surface is the core, which contains radioactive elements. As these elements disintegrate into lighter elements, they convert part of their mass into energy in accord with Albert Einstein's equation: energy...
[The entire page is 1031 words long]
1980's Science and Technology Primary Sources
The 1980's: Primary Sources
