What was among of the first things the volcanologists from the U. S. Geologist Survey do when they arrived at Clark Air Force base near Mt. Pinatubo

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.

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