2. Exploding Volcanoes Second Grade State Standard: 3(b) Students know that rock is composed of different combinations of minerals. State Standard: 3(b) Students know that rock is composed of different combinations of minerals.By Elizabeth Ramirez

3. Principal types of volcanoes  Cinder cones  Composite volcanoes  Shield volcanoes  Lava Domes

4. How are volcanoes formed  Deep in the earth is very hot. It is very hot that rocks melt.  The melted rock is called magna.  The magna is lighter than the rocks around so it rises.  Sometimes the magna finds a crack or hole in the earth’s crust and burst through.

5. Why do volcanoes erupt?  Pressure builds deep in the earth where the magma is.  Volcanoes gases are the driven forces of eruptions  Volcanoes gases are dissolved in molten rocks

7. Structure of a typical composite volcano

8. Volcano’s Websites  www.Proteacher.com  www.Emunic.emich  www.nebo.edu/misc/learning