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When the volcano erupts, large cinders fly out. Also, pyroclastic flows occur.
Magma is formed deep underground, and because it is lighter than the surrounding matter, it gradually rises and accumulates in shallow underground areas where the weight is balanced. Volatile components such as water, carbon dioxide, and sulfur dioxide are dissolved in magma. It suddenly increases, the whole magma becomes lighter and rises, and an eruption occurs.
Volcanoes are formed when magma rises from the ground and reaches the surface, lava flows, and volcanic ash accumulates.
Every continent on Earth has volcanoes, but Australia has none.
There are three types of volcanoes.・Cinder Cone Volcano・Composite volcano・Shield Volcano
There are about 1,350 volcanoes around the world, including Mt. St. Helens, Kilauea, and Mt. Fuji.
Magma is 800 to 1200 degrees near the surface.Sulfur magma has a temperature of about 150 degrees Celsius, which is lower than that of ordinary magma.
The temperature of lava is 1120-1190 degrees for basaltic lava from Kilauea volcano in Hawaii and 900-1000 degrees for dacite lava from Showa Shinzan.

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