Other than some past glacial activity, the arid climate of the Altiplano region has kept erosion rates low, meaning that the volcanic edifice is well preserved; on the flip side, lack of erosion also means that relatively little of its internal structure is exposed.
Other than some past glacial activity has kept erosion rates low. The volcanic edifice is well preserved. This was what other than some past glacial activity was meaning. Some past glacial activity is the arid climate of the Altiplano region. Relatively little of its internal structure is exposed. Lack of erosion also means this. This is on the flip side.