Thursday, August 19, 2010

Research and Investigation

Arch bridge
It has great natural strength. Thousands of years ago, Romans built arches out of stone. Today, most arch bridges are made of steel or concrete, and they can span up to 800 feet.


1 comment:

  1. Great Work girls! You have successfully set up your blog, and it's so pretty! Don't forget that your blog titles should follow the same path as the design process. You are missing the post for your design problem and situation.

    ReplyDelete