GEOLOGY

Detailed explanation-1: -Molten rock and gas leave the volcano through an opening called a vent. Often, there is one central vent at the top of a volcano. However, many volcanoes also have other vents that open on the volcano’s sides. A lava flow is the area covered by lava as it pours out of a vent.

Detailed explanation-2: -Scientists use the term magma for molten rock that is underground and lava for molten rock that breaks through the Earth’s surface.

Detailed explanation-3: -Molten rock below the surface of the Earth that rises in volcanic vents is known as magma, but after it erupts from a volcano it is called lava.

Detailed explanation-4: -A volcanic vent is an opening exposed on the earth’s surface where volcanic material is emitted. All volcanoes contain a central vent underlying the summit crater of the volcano.