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I'll copyedit as I go; please revert any mistakes.
It includes a number of volcanoes, some of which like Huaynaputina have had large eruptions and others such as Sabancaya and Ubinas have been active in historical time: needs rephrasing; the context is intended to be the CVZ, but as it stands "It" refers to Sabancaya.
Fixed.
Moraines at elevations of 4,450–4,250 metres (14,600–13,940 ft) above sea level testify to the occurrence of more extensive glaciation during the last ice age between 25,000 and 17,000 years before present, they have diverted some lava flows: does this mean that these glaciations diverted some lava flows, or that the moraines did so?
Remedied.
at temperatures of 990–920 °C (1,814–1,688 °F): it's usual to give this sort of range in ascending order of values.
Changed.
The presence of an ice cap is an additional source of danger, as their melting: singular "ice cap", so you can't have plural "their".