24K views · 111 reactions | Entire volcano eruption video — see comments!  | America Alerts | Facebook

Insane footage of a volcano explosion. | This is Happening

49K views · 694 reactions | Volcanoes are as dangerous as they are majestic. Over 50 eruptions rock our planet every year. This video helps you understand what causes volcanoes to form and erupt—and shows where they are most likely to be found. | National Geographic TV | Facebook

VOLCANO FORMATION (Volcanology) INTRODUCTION Volcanology is the scientific study of volcanoes, lava, magma, and related geological phenomena. A volcano is an opening in the Earth’s crust through which molten rock (magma), gases, and ash escape from beneath the surface. FORMATION OF VOLCANOES 1. HEAT AND PRESSURE IN THE MANTLE: Deep within the Earth, high temperatures and pressures cause rocks to melt, forming magma in the mantle. 2. MAGMA MOVEMENT: Because magma is less dense than the surroundin