Magma 01
Magma 01 : Natural Disaster. Magma is a mixture of molten rock, crystals and gases present beneath the Earth's surface. It usually accumulates in magma chambers before erupting at the surface. Magma is divided into types according to silica (SiO2) content, which controls viscosity (ease of flowing) and hence influences eruptive styles. The most silica-poor (45-55 wt.% SiO2) fluid magmas are called basaltic magmas. Andesitic and dacitic magmas have intermediate compositions (55-63 wt.% and 63-70% SiO2, respectively). The most silicarich, viscous magmas (> 70 wt.% SiO2) are called rhyolitic magmas
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