Concept:A volcanic eruption is the sudden release of hot materials from beneath the Earth's surface.
Explanation:Inside the Earth, intense heat melts rocks to form magma.
During an eruption, this molten magma rises through cracks and vents in the crust.
Once it reaches the surface, it is called lava.
The eruption also releases gases, ash, and rock fragments.
These ejected materials spread outward from the volcano.
Therefore, the main feature of an eruption is the ejection of gases and molten magma.
Answer:D. Gases and molten magma are ejected