Glacier dynamics and flow 0.0 / 5 ? Geographyglacial geomorphologyUniversityOther Created by: tom stathamCreated on: 27-12-14 12:49 What is the density of GLACIER ICE 830 - 910 kg m-3 1 of 21 What is the density of FIRN 400 - 830 kg m-3 2 of 21 What is the density of freshly fallen snow? 50-200 kg m-3 3 of 21 What is the “rate of change of net balance with altitude” Mass balance gradient 4 of 21 What type of climate has a low mass balance gradient? Continental 5 of 21 What type of ice is at the pressure melting point? Warm ice 6 of 21 The temperature in a glacier composed of warm ice will increase with depth BECAUSE geothermal heat will warm the base of the glacier. The assertion is incorrect but the reason is correct. 7 of 21 A rock falling on the glacier surface in the upper accumulation area is most likely to follow a.. englacial and then subglacial pathway to the glacier margin. 8 of 21 A rock falling on the glacier surface in the lower ablation area is most likely to follow a.. supraglacial pathway to the glacier margin 9 of 21 A rock falling on the glacier surface in the middle accumulation area is most likely to follow a.. englacial pathway ABOVE THE TRANSPORT ZONE to the glacier margin. 10 of 21 What process brings supraglacial material to the bed? Basal melting 11 of 21 How much energy does sublimation absorb? 2834 J g-1 12 of 21 A change of state from ice to water absorbs 334 j g-1 13 of 21 A change of state from water to ice releases 334 j g-1 14 of 21 What two other processes in meltwater in addition to fluvial processes take place in meltwater erosion Sandblasting and cavitation flow 15 of 21 What is the average denudation rate across the earth? 43 mm ka-1 16 of 21 What is the average valley glacier denudation rate 100 to 500 mm ka-1 17 of 21 What is characteristic of; well sorted, from valley sides, No striations, crescentic gouges, facets etc. Passively transported debris 18 of 21 what is the most effective m for basal sliding 1m 19 of 21 Regelation is most effective on small bumps of what size? 0.5m 20 of 21 glacier flow is usually what rate? 3 - 300 m yr-1 21 of 21
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