What Is Magma?
2. Andesitic
Andesitic magma has lower concentrations of the same minerals in basaltic magma, but more silica. It flows at a temperature range of between 800C to 1000C. The lava flow of this magma is characterized by loose rubble with mostly polygon shapes with smooth surfaces.
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This is referred to as a block lava flow. Andesite is mostly found in stratovolcanoes that produce moderate eruptions with a thick lava flow that is full of rubble. It does contain more dissolved gases, so although the eruptions are moderate, they also tend to be explosive when reaching the surface.
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