Mondeling Mantle Convection Currents

In science class we had to do a lab which is called " Modeling Mantle Convection Currents". This lab was about to model the earths mantle in water and how volcanoes form and erupt. There was a lot of process to do while the lab. First we collected materials which were: Play dough, hot water, cold water, aluminum foil, rubber band, food coloring, a big bottle ( gallon bottle), and a small glass beaker. Now let me tell you the process, First we filled the Gallon with cold water, then we filled the beaker with hot water and colored the water with food coloring and closed the beaker with aluminum foil and after wards we placed the beaker in the cold water and poked 1-2 holes in the foil and green hot water started to float out from the beaker and we have also put some paper circles in the cold water which were pushed by the warm water which was coming out of the beaker. This lab was supposed to show us how underwater volcanoes work