5.18. In Wikipedia, look up "Eruption column", read the intro and then scroll down to "Structure", and answer this question: An explosive volcanic eruption creates a rising column of material that evolves due to several processes. Which of the following is not one of those processes?a. Material is violently forced upward out of the crater by the pressure of rapidly expanding gases.b. Convection carries hot, buoyant material to higher altitudes.c. When the rises column cools sufficiently to no longer be buoyant, it ceases to rise and instead spreads out into what is called the umbrella region.d. All the above are components of an eruption column.

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