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Net gain in an ice mass

Consequent effect of acid rain

Contains high proportion of silca

Dry deposition of sulphur dixoide, nitrogren oxides and nitric acid, and wet depostion to form precipitation, mist, clouds

Upper layer of soil in which undergoes seasonal thawing in periglacial areas which experience permafrost conditions

Temperature changes in air independant of other conditions

Slope of hill/valley facing the Sun

Physical/chemical bonding of liquids/solids/gases

Horizontal transfer of heat

Process of erosion by wind