GEOLOGY

Detailed explanation-1: -A volcano is a weak spot in the crust where molten material, or magma, comes to the surface. Magma is a molten mixture of rock-forming substances, gases, and water from the mantle. When magma reaches the surface, it is called lava. When lava has cooled, it forms solid rock.

Detailed explanation-2: -Magma is a molten and semi-molten rock mixture found under the surface of the Earth. On the rare occasions when magma breaks the surface, as in a volcanic eruption, it is called lava.

Detailed explanation-3: -Magma is molten rock that is located under the surface of the Earth. A magma chamber is usually located far beneath the surface of the Earth where an oceanic plate is driven down into the mantle by a continental plate. The oceanic plate melts as it desends into the upper layer of the mantle.

Detailed explanation-4: -Under the volcano is a compartment of molten (melted) rock known as the magma chamber. This molten rock or magma travels from the magma chamber up through the crust of the Earth through a crack known as a vent. Hot magma exits the volcano at the crater, becoming lava.