Magma

Molten silicateThe most abundant group of minerals in Earth's crust, the structure of silicates are dominated by the silica tetrahedron, SiO44-, with metal ions occurring between tetrahedra). The mesodesmic bonds of the silicon tetrahedron allow extensive polymerization and silicates are classified according to the amount of linking that occurs between the (rock) beneath the surface of a planetary body or moon. When it reaches the surface, magma is called lavaHot molten or semifluid rock derived from a volcano or surface fissure from a differentiated and magmatically active parent body..