Other slides in this set

Slide 2

Preview of page 2

Here's a taster:

MASS BALANCE
· The balance between ablation and
accumulation over a year
· Shows whether the glacier advanced or
retreated
· Zone of accumlation is the upper part of the
glacie
· Zone of ablation is the lower part
· More ablation happens in summer, more
accumulation happens in winter
· Glaciers have been retreating recently due to
rising temperatures.…read more

Slide 3

Preview of page 3

Here's a taster:

WARM BASED GLACIERS
· The base is warmer than the melting point of
ice because of the friction from the glacier
moving
· This causes the ice at the base to melt
· The meltwater acts as a lubricant, making it
easier for the glacier to move downhill
· Because they move fairly fast they are very
erosive
· Generally found in temperate climates (eg
Alps)…read more

Slide 4

Preview of page 4

Here's a taster:

COLD BASED GLACIERS
· The base is colder than the nelting point of ice
· This means there is very little melting and so
little movement
· The ice is frozen to the valley floor, so not very
erosive
· Generally found on ice caps…read more

Slide 5

Preview of page 5

Here's a taster:

HOW A GLACIER MOVES
· BASAL FLOW: The meltwater underneath the
glacier allows it to slide over the ground. The
main way that warm-based glaciers move
· INTERNAL FLOW: The ice crystals move past
each other under gravity causing the ice to
bend and warp downhill like a liquid. The main
way that cold-based glaciers move…read more

Slide 6

Preview of page 6

Here's a taster:

HOW A GLACIER MOVES
· COMPRESSIONAL FLOW: When the ice flows
over a gentler gradient it becomes thicker
(making it more erosive) and moves more
slowly. Cracks form in the ice from the
pressure of ice movement upstream
· EXTENSIONAL FLOW: When the ice flows over
a steeper gradient it moves faster and
becomes thinner (so less erosive). Crevasses
form as the base moves faster than the
surface, which is more brittle…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Slide 10

Preview of page 10
Preview of page 10

Comments

No comments have yet been made

Similar Geography resources:

See all Geography resources »See all resources »