Here's a breakdown:
* Magma: Molten rock found beneath the Earth's surface.
* Lava: Magma that has erupted onto the Earth's surface.
* Volcano: A vent or fissure in the Earth's crust through which lava, ash, and gases erupt.
The eruption of lava and other materials builds up over time, creating the characteristic cone shape of a volcano. There are different types of volcanoes, each formed by different types of eruptions and magma compositions.
