Magma a Magma has a wide range of compositions, but silica(SiO2)always dominates the mix. Magma has high temperatures. Magma is fluid--it has the ability to flow a Most magma actually is a mixture of liquid (often referred to as melt) and solid mineral grains.Magma ◼ Magma has a wide range of compositions, but silica (SiO2) always dominates the mix. ◼ Magma has high temperatures. ◼ Magma is fluid—it has the ability to flow. ◼ Most magma actually is a mixture of liquid (often referred to as melt) and solid mineral grains