وصف علمي لظاهرة البراكين. بركان

Some are active and, in shallow water, disclose their presence by blasting steam and rocky debris high above the surface of the sea Many others lie at such great depths that the tremendous weight of the water above them prevents the explosive release of steam and gases, although they can be detected by and discoloration of water because of
, , , debris flow and emission The was recently established to protect this unusual landscape, which lies north of and south of the near the boundary with the

Classic examples include in Japan, in the Philippines, and and in Italy.

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البراكين
Finally, explosive volcanic eruptions release the greenhouse gas carbon dioxide and thus provide a deep source of for biogeochemical cycles
لماذا تحدث البراكين ؟ وما آثارها وفوائدها ؟
is a common eruptive product of submarine volcanoes
البركان
Vents that issue volcanic material lava, which is what magma is called once it has escaped to the surface, and and gases mainly can be located anywhere on the landform
- A guide for children and youth• Because siliceous magmas are so viscous, they tend to trap gases that are present, which cause the magma to erupt catastrophically, eventually forming At , where two oceanic are pulling apart, basaltic lava erupts as to fill the gap;• Stratovolcanoes are also known as composite volcanoes
These fertile soils assist the growth of plants and various crops In this case, the oceanic plate subducts, or submerges under the continental plate forming a deep ocean trench just offshore

The biggest eruption in the last 10,000 years, the volcanic ash was found deposited on the ice surface under the , close to.

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لماذا تحدث البراكين ؟ وما آثارها وفوائدها ؟
The origin of the term comes from , which is one of the several tuyas in the area of the and in northern British Columbia
بركان
in is an example of a volcano formed from felsic lava and is actually a large lava dome
لماذا تحدث البراكين ؟ وما آثارها وفوائدها ؟
These can be relatively short-lived eruptions that produce a cone-shaped hill perhaps 30 to 400 meters high