GEOLOGY

Detailed explanation-1: -Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Since it is lighter than the solid rock around it, magma rises and collects in magma chambers . Eventually, some of the magma pushes through vents and fissures to the Earth’s surface.

Detailed explanation-2: -Volcanoes form here in two settings where either oceanic plate descends below another oceanic plate or an oceanic plate descends below a continental plate. This process is called subduction and creates distinctive types of volcanoes depending on the setting: ocean-ocean subduction produces an island-arc volcano.

Detailed explanation-3: -Volcanic mountains form when molten rock from deep inside the Earth erupts through the crust and piles up on itself. The islands of Hawaii were formed by undersea volcanoes, and the islands seen above water today are the remaining volcano tops.

Detailed explanation-4: -When lava just flows out of the crater and gaps along the sides of the volcano, it is an explosive eruption.

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).