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: -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: -11) volcanic mountain This is formed when molten material and ash reaches Earth’s surface through a weak crustal area and piles up into a cone-shaped structure.

Detailed explanation-4: -About five percent of all known volcanoes form in the middle of plates, not at their edges. These intraplate volcanoes are caused by hot spots, unusually hot areas deep within the Earth. Magma rises from the hot spots and erupts as lava through cracks in the Earth’s surface forming volcanoes.