In 1991 mount pinatubo exploded throwing tons of pollutants and ash into the atmosphere giving climatologists and scientists a real world laboratory to study. what was one result for climatologists of the mount pinatubo eruption

Climatologists could evaluate their expectations of the emission on worldwide temperatures. 
The action of Ancestral Pinatubo appears to have started around 1.1 million years prior and presumably finished a huge number of years or more before the introduction of "present day" Pinatubo. A significant part of the tough land around the present spring of gushing lava comprises of remainders of "hereditary" Pinatubo. It was an andesite and dacite stratovolcano whose eruptive movement was substantially less hazardous than present-day Pinatubo. Its inside was generally where the present well of lava is.

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