<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/1912eaa7-d5b8-4fbb-9f3f-025643950041/41C0D63D-7833-4898-8218-B6F15BD311E0/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://dsc.discovery.com/news/2008/01/11/plate-tectonics-earth.html?dcitc=w19-506-ak-0008" href="http://dsc.discovery.com/news/2008/01/11/plate-tectonics-earth.html?dcitc=w19-506-ak-0008" style="font-size: 11px;">dsc.discovery.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2008/01/11/plate-tectonics-earth.html?dcitc=w19-506-ak-0008"><P><STRONG>Jan. 11, 2008</STRONG> -- Four decades after the rise of the great, unifying theory of plate tectonics, geologists are still scratching their heads over a lot of the details. </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2008/01/11/plate-tectonics-earth.html?dcitc=w19-506-ak-0008"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/dsc.discovery.com/img/555A2C6D-C7C3-4227-9A1D-C62AC137021E" alt="Puzzle Planet" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2008/01/11/plate-tectonics-earth.html?dcitc=w19-506-ak-0008"><P>Unanswered, for instance, are basic questions like how the shifting and colliding of plates got started, what keeps plates moving, why <A target="_blank" href="http://dsc.discovery.com/video/player.html?bctid=1372119749">other planets</A> in our solar system lack plate tectonics, and how important all the geological turmoil might be to the evolution of life. </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2008/01/11/plate-tectonics-earth.html?dcitc=w19-506-ak-0008"><P>Another iconoclastic hypothesis just out last week goes after the question of whether plate tectonics ever stops. Has it ever done so? Geologist Paul Silver of the Carnegie Institution of Washington thinks it's possible. </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2008/01/11/plate-tectonics-earth.html?dcitc=w19-506-ak-0008"><P>"It's an implicit assumption that plate tectonics never shuts down," Silver told Discovery News. "But it's nowhere stated in plate tectonics theory." </P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/41C0D63D-7833-4898-8218-B6F15BD311E0/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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