Skip Navigation

  Button that takes you to the Problem Based Learning model page. Button that takes you to the references page. Button that takes you to the related links page. Button that takes you to the glossary page. Button that takes you to the modules and activities page. Button that takes you to the teacher pages. Button that takes you to the home page.Image map of some Temperate Rainforest puzzle pieces. Please have someone assist you with this.

 

Image of a Douglas fir that has been blown down.This photo illustrates why many of the great trees of the temperate rainforest are vulnerable to strong winds. The Douglas fir in the foreground once stood more than 80 feet tall. While there are many shallow roots that fan out from the trunk base, there is no taproot that might have held the tree upright. Since the teenager in the picture is almost six feet tall, we may estimate that the roots extend from the trunk center about 15 feet. Yet, this broad arrangement of shallow roots was apparently no substitute for a sturdy taproot, without which the great fir was vulnerable to "blowdown." Wind is currently the main source of natural disturbance in the shallow-rooted forests of the Northwest.

 

 

 

 

 

 

 

 

[ Glossary ] [ Related Links ] [ References ] [ PBL Model ]

[ Home ] [ Teacher Pages ] [ Modules & Activities ]

Button that takes you back to the Temperate Rainforest main page.

HTML code by Chris Kreger
Maintained by ETE Team
Last updated November 10, 2004

Some images © 2004 www.clipart.com

Privacy Statement and Copyright © 1997-2004 by Wheeling Jesuit University/NASA-supported Classroom of the Future. All rights reserved.

Center for Educational Technologies, Circuit Board/Apple graphic logo, and COTF Classroom of the Future logo are registered trademarks of Wheeling Jesuit University.