in the degradation level of volcanoes, independent of other factors. The methodology employed is based on geomorphological and morphometric analyses. Only 39.5% of the Tenerife volcanoes have gullies; nevertheless, more than 84.6% of the Pleistocene cones present
gullies, compared to only 20% of the Holocene volcanoes. Therefore, the older volcanoes appear to have been more affected by torrential rains. Although the age of a volcano is an essential factor in the degree of erosion, other factors intervene as well.