GEOLOGY

Detailed explanation-1: -Extrusive Igneous Rocks: Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the Earth’s surface. These are the rocks that form at erupting volcanoes and oozing fissures.

Detailed explanation-2: -Eventually, some of the magma pushes through vents and fissures to the Earth’s surface. Magma that has erupted is called lava.

Detailed explanation-3: -Vents, the openings at the surface where volcanic eruptions occur, and conduits, the channelways that lead from the magma reservoir to the vent, are the only features that all volcanoes have.

Detailed explanation-4: -Magma is extremely hot liquid and semi-liquid rock located under Earth’s surface. Earth has a layered structure that consists of the inner core, outer core, mantle, and crust. Much of the planet’s mantle consists of magma. This magma can push through holes or cracks in the crust, causing a volcanic eruption.