ANATOMY

Detailed explanation-1: -Eventually, some of the magma pushes through vents and fissures to the Earth’s surface. Magma that has erupted is called lava.

Detailed explanation-2: -Much of the planet’s mantle consists of magma. This magma can push through holes or cracks in the crust, causing a volcanic eruption. When magma flows or erupts onto Earth’s surface, it is called lava.

Detailed explanation-3: -Molten rock, i.e., magma, is less dense and more buoyant than the surrounding rock, as a result magma rises through Earth’s crust. Most magma is trapped in the crust, but some erupts onto the Earth’s surface as lava.

Detailed explanation-4: -Magma is produced by melting of the mantle or the crust in various tectonic settings, which on Earth include subduction zones, continental rift zones, mid-ocean ridges and hotspots.