As magma builds, it forms an underground lake of hot liquid. Use water filled balloon. Do not tie the top, only pinch it off. Release water as books apply pressure. Students can demonstrate this activity with teacher in control of the balloon.
Hot lava is magma that has cooled and included melted minerals, dirt, and gases.
Hot Lava flows out of the top of a volcano and slides down the side of the mountain. When it cools it forms a hard black rock called pumice. Ash, Dust, and smoke also come from a volcano. Ash and dust from a volcano can travel hundreds of miles in the air and fall like snow. Review the parts of a volcano.