It is very hard to definitively say, given that many of these volcanic structures are buried underneath several kilometers of ice.[11] However, ash layers within the West Antarctic Ice Sheet,[12] as well as deformations in the ice surface[13] indicate that the West Antarctic Rift System could be active and contain erupting volcanoes. Additionally, seismic activity in the region hints at magma movement beneath the crust, a sign of volcanic activity.[14] Despite this, however, there is not yet definitive evidence of presently active volcanoes.