Science experiments… Yippee! Plastic rock flows like a thick liquid and then solidifies when you squeeze it or subject it to an abrupt force. Put 1 cup cornstarch in a pan and add 2/3 cup water; stir until evenly mixed. Next add ½ cup more cornstarch. As you mix it, it should solidify. Leave it alone, it should liquefy again. Put some in your hand… squeeze – solid, cup your hand – liquid.
The above experiment is from the Physical Science book (ed. 2) p. 136-137.
More on this experiment in a few weeks.....
Why does this work?
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