Mass Extinction: Examining the Current Crisis

by Tricia Andryszewski

Some scientists believe that Earth is heading toward a crisis--its sixth great mass extinction, where possibly two-thirds of its existing species could disappear. But what do scientists know for sure?... This description may be from another edition of this product.

• Format: Library Binding
• Language: English
• ISBN: 082257523X
• ISBN13: 9780822575238
• Release Date: January 2008
• Publisher: Twenty-First Century Books (CT)
• Length: 111 Pages
• Weight: 0.40 lbs.
• Dimensions: 0.5" x 7.6" x 9.0"
• Age Range: 11 to 14 years
• Grade Range: Grades 6 to 9