Written by Alyssa Burley.

On Wednesday, September 29, 2015, Project Cornerstone’s Crystal Howard and Alyssa Burley visited three 5th-grade classes at Central Elementary in San Diego, CA.

Students learned about construction aggregates (i.e., sand, gravel and crushed stone) and how they are used to build roads, homes and schools in their communities.

The in-class program included a lecture about the local construction aggregates industry and sand shortage, a lab experiment where students analyzed sand samples to determine which type is best for making concrete, and a science project where students were able to make small concrete to take home.

Project Cornerstone will return to Central Elementary on Wednesday, October 7, 2015 to visit two more 5th-grade classes.