GLACIER TYPES

1
GLACIER TYPES

• Valley (alpine)
• Ice sheets (continental)
• Greenland, Antarctica
• Ice caps
• Piedmont glaciers
• Icebergs

2
GLACIER ZONES

• Zone of accumulation
• Zone of ablation
• Zone of fracture (top 50 m)
• crevasses

3
GLACIAL EROSION

• Abrasion
• Rock flour
• striations
• Plucking

4
EROSIONAL FEATURES

• U - Shaped trough
• Hanging valleys
• Cirques
• Aretes
• Horns
• fjords

5
GLACIAL DEPOSITS

• Till
• Moraines (lateral, medial, ground, terminal end,
  recessional end)
• Drumlins
• kames
• Stratified drift (outwash)
• Outwash plain
• Kettles
• eskers
• Erratics

6
ICE AGES

• Glaciers covered 30 of land (now 10)
• Illinoisian - 100,000 years ago
• Wisconsinan - 12,000 years ago
• Causes - plate tectonics, orbital changes
  (eccentricity, obliquity, precession, drops in
  CO2, drop in solar intensity, change in ocean
  currents
• Effects - isostatic rebound, sea level rise and
  fall

7
WIND EROSION

• Deflation
• Blowouts
• Desert pavement
• Abrasion

8
WIND DEPOSITS

• Loess
• Dune formation
• Windward side
• Leeward side (slip face)
• Factors that affect
• Wind direction
• Amount of sand
• Amount of vegetation

9
DUNE TYPES

• Barchan
• Transverse
• Barchanoid
• Parabolic
• Longitudinal
• Star