Volcanoes

When magma from below rises and leaks into the crust, volcanoes will be formed. Magma is a hot material, which comes either from a melt of subducted crustal material or from the deeper interior of a planet .
Rising from lower reaches, magma gathers in a reservoir, in a weak portion of the overlying rock called the magma chamber. Usually the magma eventually erupts onto the surface. Strong earthquakes is followed by rising magma, and the volcanic cone may swell in appearance, just before an eruption. Scientists often monitor the changing of the shape in a volcano, especially before an eruption. A volcano forms via plumes or hot spots in the lithosphere, as a result of subduction of the nearby lithosphere.

Volcanoes can form in several ways , just as there are several different types of volcanoes. Volcanism is part of the process by which a planet cools off.

Rising from lower parts of the Earth, hot magma eventually, erupts onto the surface in lava form. Duringa volcano eruption, flowing lava and ash forms a large cone. This cone is known as a volcano.

Different kinds of volcanoes :

-shield volcanoes
-cinder cones
-composite volcanoes
The most common kinds of volcanoes on the Earth's surface are those that form the "Pacific Rim of Fire". Those are volcanoes which form as a result of subduction of the nearby lithosphere.

1. Magma reservoir
2. Country rock
3. Conduit (pipe)
4. Base
5. Sill
6. Branch pipe
7. Layers of ash emitted by the volcano
8. Flank
9. Layers of lava emitted by the volcano
10. Throat
11. Parasitic cone
12. Lava flow
13. Vent
14. Crater
15. Ash cloud



	When magma from below rises and leaks into the crust, volcanoes will be formed. Magma is a hot material, which comes either from a melt of subducted crustal material or from the deeper interior of a planet . Rising from lower reaches, magma gathers in a reservoir, in a weak portion of the overlying rock called the magma chamber. Usually the magma eventually erupts onto the surface. Strong earthquakes is followed by rising magma, and the volcanic cone may swell in appearance, just before an eruption. Scientists often monitor the changing of the shape in a volcano, especially before an eruption. A volcano forms via plumes or hot spots in the lithosphere, as a result of subduction of the nearby lithosphere. Volcanoes can form in several ways , just as there are several different types of volcanoes. Volcanism is part of the process by which a planet cools off. Rising from lower parts of the Earth, hot magma eventually, erupts onto the surface in lava form. Duringa volcano eruption, flowing lava and ash forms a large cone. This cone is known as a volcano. Different kinds of volcanoes : -shield volcanoes -cinder cones -composite volcanoes The most common kinds of volcanoes on the Earth's surface are those that form the "Pacific Rim of Fire". Those are volcanoes which form as a result of subduction of the nearby lithosphere. 1. Magma reservoir 2. Country rock 3. Conduit (pipe) 4. Base 5. Sill 6. Branch pipe 7. Layers of ash emitted by the volcano 8. Flank 9. Layers of lava emitted by the volcano 10. Throat 11. Parasitic cone 12. Lava flow 13. Vent 14. Crater 15. Ash cloud