INTERNAL DEFORMATION
o Deform internally under the influence of gravity
o Glacier ice is aniosotrophic, with lattice defects, slippage of planes of atoms
BASAL SLIP
o Ice at pressure melting point
o Ice mass slips over a thin layer of meltwater
o Not continuous
o Reduction of pressure melting point effectively refreezing & immobility
o Localized grounding due to water removal by freezing or drainage
o Regelation and enhanced creep
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