What is molten rock that reaches the Earth's surface through a volcano known as?

Molten rock that reaches the Earth's surface through a volcano is known as lava. When magma, which is the molten rock found beneath the Earth's surface, erupts from a volcano, it flows out and is referred to as lava. This lava can vary in composition and temperature and can create different types of volcanic landforms as it cools and solidifies.

In contrast, silt is a fine particle of soil and is not related to volcanic activity. Bedrock refers to the solid rock that lies beneath soil and other loose material, and it is not in a molten state. Ashes, while they can be produced during a volcanic eruption in the form of fine particulate matter, refer specifically to solid particles that are erupted rather than the molten material that becomes lava. Thus, lava is the precise term for the molten rock that flows from a volcano.