Volcanic products are materials that are released during a volcanic eruption. The two most common volcanic products are LAVA and ASH. LAVA is molten rock that is expelled from a volcano during an eruption. It is usually very hot and can cause significant damage to the surrounding area. ASH is made up of tiny particles of rock, minerals, and glass that are blasted into the air during an eruption. It can travel long distances and can cause respiratory problems if inhaled.