GEOB 103 Lecture Notes - Lecture 16: Periglaciation, Melting Point, Phase Boundary
Water is unusual because the range of temperatures and pressures common on earth s surface. It can exist as a vapour, liquid, solid. Negaive slope of the phase boundary between liquid and solid water, mean that as pressure increases. At 2000m depth the meling temperature is -1. 6c. Temperate glacier temperature will be close to pressure meling point. Diferenial stresses along low cause the surface to crack (crevasses) Video: glacial and periglacial landscape evoluion erosion by a glacier can take place by ice push, plucking, or abrasion this polished and scratched rock surface was caused by a moving ice sheet. Abrasion by larger rock fragments made the long straight scratches known as glacial striaions. Evidence of glacial abrasion includes glacially-transported rock fragments that show polish, striaions, and grooves. Both clasts and bedrock are likely to show these features. Factors that inluence abrasion: amount of debris basal Erraics: a boulder-sized rock dumped by a glacier.