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| | Mineralogy Notes |
 | | Further, gravitational instabilities within each galaxy caused further collapse of the gas into primitive stars where the very high temperatures caused by gravitational collapse ignited the fires of thermonuclear fusion in which the nuclei of the primitive light elements combined to form heavier elements. |
 | | Before temperatures cooled sufficiently in the inner solar system so that the most volatile elements (H, C, N, and the noble gases) could condense, H fusion in the sun ignited and blew these elements to the outer solar system where they are enriched in the outer planets, Jupiter, Saturn, Uranus, and Neptune. |
 | | The Earth accreted from these early solid particles called chondrules, and these refractory elements are enriched in the Earth relative to their abundance in the Sun. |
| ruby.colorado.edu /~smyth/G30101.html (4189 words) |
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