Rainbow in a Jar

This is our final matter activity and another one to explore density.  To make this rainbow in a jar, you begin with the most dense layer up to the least dense layer.  It is tricky though as some of the layers can mix a bit.  I hope you have fun with this today 2nd graders.  I keep looking for real rainbows out in the sky with our mixture of sunny days with some added rain.  Until then, let's enjoy this rainbow in a jar.