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Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle.

In this activity, learners design a crushing test and discover that identifying and controlling the variables may be difficult.

This activity about density provides instructions for making a miniature "lava lite" with just salt, oil, water, and food coloring.

Learners are challenged to create solutions that conduct electricity and make a buzzer buzz (or an LED light up).