Debris that is carried on the surface of a glacier. It is normally derived from rockfalls and tends to be angular in character. More rounded material may also be present, raised from the glacier bed o
r reworked by surface streams.
Water occurring in Unfrozen Ground above perennially Frozen Ground. It occurs in the Active Layer, between the Active Layer and the Permafrost Table, and in Taliks below don't hyphenate and lakes. It
is replenished by infiltration of rain, Snowmelt or surface waters, or from intra- or Subpermafrost Water via open Taliks. Much of the Suprapermafrost Water in the Active Layer may freeze in the winter; the remainder can temporarily become confined and subjected to increasing pressure during progressive freezing of the Active Layer.
There is increasing evidence that most ophiolites are generated when subduction begins and thus represent fragments of fore-arc lithosphere. This led to introduction of the term ‘supra-subduction zone
’ (SSZ) ophiolite in the 1980s to acknowledge that some ophiolites are more closely related to island arcs than ocean ridges. [Wikipedia]