Lava is molten rock that has been expelled from the Earth's interior onto its surface . While underground, this material is known as ; it only becomes lava once it erupts from a volcano or fissure . Chemical Composition
Lava is primarily a mixture of liquid rock, crystals, and dissolved gases . Its behavior—how fast it flows and how it erupts—is largely determined by its .
Lava is molten rock that has been expelled from the Earth's interior onto its surface . While underground, this material is known as ; it only becomes lava once it erupts from a volcano or fissure . Chemical Composition
Lava is primarily a mixture of liquid rock, crystals, and dissolved gases . Its behavior—how fast it flows and how it erupts—is largely determined by its .