This powerpoint is meant to go along with the lesson and worksheet that I created, but can stand alone. It takes students through the composition of Earth's early and second atmosphere's. It has the methods for a simple, yet exciting laboratory using manganese dioxide to simulate the out-gassing of volcanoes. Personal protective gear should be used during this laboratory, as it is an exothermic reaction that produces heat. Teachers should look up the safety precautions necessary when using manganese dioxide and hydrogen peroxide.