streambed model material

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From: Abbott, Franklin R (FABBOTT@houstonisd.org)
Date: Wed Mar 30 2005 - 07:14:02 PST 

Subject: streambed model material
Date: Wed, 30 Mar 2005 09:14:02 -0600
Message-ID: <973D5EBB28276045981856BA2DEDCDD2021500D6@admin-mbx05.ad.hisd.org>
From: "Abbott, Franklin R" <FABBOTT@houstonisd.org>

I have used diatomaceous earth (DE). However, it is not rigid enough to keep its shape if moved. The GEMS "River Cutters" book (grades 6-9) details how students can conduct experiments to model a variety of river flow features. GEMS recommends using DE that is made for swimming pool filtration systems, NOT agricultural (garden) DE. Safety note: If you use it, make sure that the kids don't prepare/use the dry DE. Breathing the dust can be hazardous.

Frank Abbott
Houston, TX

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