How were all outside variables that could affect the outcome of the experiment controlled?

All outside variables that could affect the outcome of the experiment are controlled by keeping the water a specific temperature by heating it, cooling it, and keeping the room a certain temperature. We also made sure that we didn't touch the water or the substance with our hands.

“when two plates carrying continents collide, the continental crust buckles and rocks pile up, creating towering mountain ranges. when an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. this process is called subduction. “ i found this on google i hope it