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A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava . When it does reach the surface, however, a volcano is formed. Typical examples are Mount Etna and the volcanoes in the Pacific Ring of Fire.
When a large body of magma has formed, it rises thorugh the denser rock layers toward Earth's surface. Magma that has reached the surface is called lava.
3 Nov 2016 Volcano Formation (Plate Tectonics) The Earth's crust is composed of enormous sections of rock called tectonic plates. The now molten hot rock or magma creates great pressure, and over time, it finds its way through the fractures in the plates. Once magma reaches the surface of the Earth, it is called lava.
Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.
29 Apr 2016 Volcanoes form when hot material from below risesand leaks into the crust. This hot material, called magma, comes either from a melt of
Key facts. A volcano is formed by eruptions of lava and ash. Volcanoes are usually cone shaped mountains or hills. When magma reaches the Earth's surface it
Shield volcanoes build up gradually for a long time, experiencing numerous eruptions and forming layers during the period. These kinds of volcanoes do not
Volcanoes dominate the landscape in Nicaragua and Costa Rica – big, massive Most volcanoes are formed by the movement of tectonic plates on the surface
Magma can also push up under the middle of a lithosphere plate, though this is much less common than magma production around plate boundaries.
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