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Glacial features
1. *
Peter Knight's Photos of Landscapes and
Glaciers
(Keele University)
2. FORMS OF ICE
• GLACIER – a moving mass of ice on a land surface
• NICHE ICE – ice which has accumulated in a hollow high up
on the mountain side
• CIRQUE GLACIER – deepened hollow filled with ice
• ICE CAP – large area of ice, which has spread outwards
from a central area.
• VALLEY GLACIER – large mass of ice from a cirque or ice
field, which follows existing valleys
• ICE SHEET – huge areas of ice which spread outwards from
central domes
3. Niche glaciers
The smallest scale of
glaciation: Niche glaciers
and ice aprons in the Grand
Tetons, Wyoming, USA.
Small glaciers such as these
are often the most sensitive
to local climate change.
4. The summit ice cap of the volcano,
Cotopaxi, Ecuador
The ice cap extends further on one side of the mountain. The side
of the mountain facing the moisture-bearing winds has higher
snowfall and hence more extensive glaciation. The deep channels
carved by meltwater and by volcanic mudflows (lahars) caused by
melting of snow and ice during eruptions.
15. As a glacier slides over its bed, it picks up rock fragments that
act as abrasive and scouring agents. As a result bedrock
surfaces, such as this limestone outcrop, commonly bear
polished and scratched (‘striated’) surfaces, as well as various
gouge-marks.!!!!!