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yes, iodized does
Science Fair: Salt Melting Ice
Science Fair: Preserving Foods
Science Fair: Taste Perception
Do plants need commercial food? Great for grades 5-8.
Do Some Colors of M Melt Faster than Others? | Education.com
Science Fair: How to Stop Soda From Exploding
Science Fair: Create Your Own Miniature Salt Flats!
Which cut flower lasts the longest? Great for grades K-5.
DIY Salt Tray and Alphabet Cards.
Determine how age affects the speed that someone can change the focus of their eyes between near sightedness and far sightedness. Great for most grades.
First grade science fair ideas