Reducing the pressure: normal molten rock beneath the Earth's crust are rarer than rocks on earth. The high pressure prevents stone not to change the state of flux. However, the high temperature of the layer asthenosphere. Molten rocks expand and lift the rise. When hot magma expansion pressure is reduced. Stone is in contact more easily melted surrounding
the origin of the magma,
magma formed not ubiquitous in the world. If available, but at the boundaries of the earth types. And hot spots of the world,
the boundaries of the earth move apart: the magma from the asthenosphere layer floating up to the surface. Voltage drop makes the crust on top is melted underwater ridges. And pushed out to the side. Earth become magma ocean formed by basalt Figure 2. For example, the South Atlantic Ridge. However, some of magma was lifted into the earth like Lake Malawi, Africa. In Africa Figure 2 source magma ridges on the ocean boundaries of the earth moving toward each other: the collision of earth plates in the subduction (Subduction zone) the plate with a density of more than settling down to. Floor asthenosphere The friction caused by the earth both friction causes heat. The water in the rock, which evaporates. The pressure drop. Allowing molten rock, the magma becomes faster. And broke away from the crater surface as shown in Figure 3, for example, Mount Fuji in Japan.
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