This quick lab is part of an earth science lesson on volcanoes and the movement of magma based on density.
It helps illustrate how/why magma rises not only with pressure from the eruption but also do to physical properties (being less dense than the surrounding solid rock).
-a jar with a lid
-red food coloring to color the water
-note paper to record the movement of the water and oil
-fill bottle 1/3 full with water and add red food coloring
-slowly add an equal amount of oil
-invert the bottle and note the changes
(Q) What is density?
(Q) Which is denser the water or oil? Why?
(Q) Which would best represent the magma and which the solid rock?