 Complete the following phrase:  Before collapse, the Mazama edifice had an estimated volume of , though it may have exceeded taking glacial erosion into account. After the climactic eruption, Mazamas peak was completely destroyed, replaced by a depression with a depth of surrounded by cliffs. The volume of magma ejected from Mazama more or less equals the volume from the peak that collapsed, which scientists have estimated at between of lava. The lava produced was zoned vertically according to arrangement within the source magma chamber, and was calc-alkaline in composition. It consisted of roughly 90 percent uniform rhyodacitic pumice, which contained about 10 percent phenocrysts, the rest made up of crystalline andesite scoria and mafic crystals. The eruption released aerosol that lowered temperatures globally in the Northern Hemisphere, with estimates of for one to three years after the eruption. The temperature changes were possibly greater than the effects of the 