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Landforms from Glacial Erosion (Stage 2 :pencil2: (Ice moves over corrie…
Landforms from Glacial Erosion
Stage 1 :checkered_flag:
Snow
accumulates
Over 40+ years air is expelled and they
compact
to from ice
Freeze-thaw action
causes rock to add to the ice creating
moraine
Weight of snow causes ice to move forward-
creep
Stage 2 :pencil2:
Ice moves over
corrie lip
Flows down
V-shaped river valley
Valley deepened through
abraison
where moraine acts like sandpaper and scrapes rock away
Widened through
plucking
Result is
U-shaped valley
with vertical sides and flat valley floor
Landforms :lock:
Truncated Spurs
Interlocking spurs
are eroded to leave flat cliff like faces :lock:
Hanging Valleys
Tributary river valleys
are eroded less so remain high up
Waterfalls are common
Ribbon Lakes
Erosion more powerful
in certain places, e.g. where two glaciers met,
deeper hollow formed
as a result
Filled with
meltwater
to from lakes
Deposited moraine sometimes helped dam lake