Working thru the Considering God's Creation-unit 4, we came upon this activity for the Sedimentary/Metamorphic rock lesson. I have not done salt dough projects in a long time-so after making the dough-I had to research to see how long we needed to bake these babies [this info was sadly missing from the guide]. Well, after a small fire (a hot pad fell down outta my pile I had used to pull the parchment paper/dough off the cookie sheet to cook the underside. I didn't see it when I closed the door-luckily the hubby spotted a small flame rising from the bottom of the oven) and then forgetting about it b/cuz it takes oh, 4-5 ish hours on about 212 degrees to bake it right [yes, it is easy to forget, and then hubby jacked up the oven to get ready for dinner]-we ended up with a decent (albeit slightly toasted looking) project. [sheesh!] Let's just say this is one project we won't soon forget! LOL....it is a great way to illustrate the idea of what happens with sedimentary rocks and fossils.
In case you want to try this yourself, you will need
1 cup of salt
1 cup of flour
and water to make it pliable
a cookie sheet and parchment paper if you don't want it sticking to the pan
items to make impressions
spread out to use, bake at 212-220 degrees for 4-5 hours until baked thru. Flip at least once 1/2 way thru to bake underside. I pulled the parchment paper with the goodies on it off the cookie sheet after it had baked for about 2-3 hours-it is safe to sit on the rack. Note to self: check for dropped hot pads. Cool-use for demos. :)
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