Here's why:

* Molten Rock: Magma is essentially molten rock found beneath the Earth's surface.

* High Temperatures: The extreme temperatures within the Earth's crust cause rocks to melt, forming magma.

* Flowing Properties: Magma can flow and move, which is a characteristic of liquids.

* Crystals and Gases: While magma contains dissolved gases and may have some solid crystals, the primary component is a molten, liquid rock.

It's important to note that magma is not a gas. Gases are in a state of matter where particles are spread far apart and move freely. Magma, while containing dissolved gases, has a much denser structure.