GEOLOGY

Detailed explanation-1: -A volcano is a land-form, a mountain, where molten rocks erupt through the surface of the planet. The volcano mountain opens downwards to a pool of molten rocks below the surface of the earth. When the pressure builds up in the earth’s crust, eruptions occur.

Detailed explanation-2: -A volcano is a mountain that opens downward to a reservoir of molten rock below the surface of the earth. Unlike most mountains, which are pushed up from below, volcanoes are vents through which molten rock escapes to the earth’s surface.

Detailed explanation-3: -A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth. This molten rock is known as magma. When it erupts, huge amounts of very hot gas, boulders, ash, and molten rock can burst out. This is thrown into the air, often pouring down the side of the mountain.

Detailed explanation-4: -A volcano is defined as an opening in the Earth’s crust through which lava, ash, and gases erupt. The term also includes the cone-shaped landform built by repeated eruptions over time.

Detailed explanation-5: -Volcanoes are mountains but they are very different from other mountains; they are not formed by folding and crumpling or by uplift and erosion. Instead, volcanoes are built by the accumulation of their own eruptive products–lava, bombs (crusted over ash flows, and tephra (airborne ash and dust).