The content you've requested is available without charge only to active Sigma Xi members and
If you are an active member or an individual subscriber, please log in now in order to access this article.
If you are not a member or individual subscriber, you can:
The Mars Pathfinder spacecraft landed in a giant Martian floodplain, at the confluence of two ancient river valleys—a site chosen for the supposed variety of rocks that would have been carried downstream by the catastrophic flood that sculpted the region billions of years ago. Aboard the spacecraft, two scientific instruments—an imager and a spectrometer—peered at and analyzed the Martian rocks and the soil with the aim of further defining the geologic history of the Red Planet. So far the results of the analyses are consistent with the hypothesis that many of the rocks have a volcanic origin, and that they have variously experienced a catastrophic flood and a period of meteoric bombardment.
Connect With Us:
An early peek at each new issue, with descriptions of feature articles, columns, and more. Issues contain links to everything in the latest issue's table of contents.News of book reviews published in American Scientist and around the web, as well as other noteworthy happenings in the world of science books.
To sign up for automatic emails of the American Scientist Update and Scientists' Nightstand issues, create an online profile, then sign up in the My AmSci area.
JSTOR, the online academic archive, contains complete back issues of American Scientist from 1913 (known then as the Sigma Xi Quarterly) through 2005.
The table of contents for each issue is freely available to all users; those with institutional access can read each complete issue.
View the full collection here.
Receive notification when new content is posted from the entire website, or choose from the customized feeds available.