Feature Earth Uncharted Territory Ultraslow ridges hold new clues to crust's formation Share this:EmailFacebookTwitterPocketRedditPrint By Carolyn Gramling March 28, 2006 at 11:17 am This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe