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📖 Description
This digital document is an article from Science News, published by Science Service, Inc. on August 29, 2009. The length of the article is 2493 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
Citation Details Title: Pearls unstrung: for a while, the Great Lakes weren't connected by rivers and Niagara Falls was just a trickle. Author: Sid Perkins Publication:Science News (Magazine/Journal) Date: August 29, 2009 Publisher: Science Service, Inc. Volume: 176 Issue: 5 Page: 18(4)