GSCE Geography Glaciation

8/6/2019 GSCE Geography Glaciation

1/14


2/14


3/14


4/14

S- Snowcollects inhollows onmountain

sides and iscompresse

d into ice

P-

Pluckingpulls out

rocks fromthe hollow,deepening

it

A-Abrasion,as the ice

movesforwards inthe hollowdue to its

own weight,

rocks thatare in theglacier rub

againstthose in the

hollow

R-

Rotationalmovement

encouragesthe hollow

to be a

basin

E- Freezethaw actionmakes theback of the

hollow

steeper

D- Deephollow, and

when the icemelts thereis often alake or a

tarn left


5/14

Firstly, explain how a corrie isformed (SPARED), then explain thatan arte is the knife edged ridgethat lies between two corries. This

ridge is sharpened further by

freezethaw action!


6/14

First explain the formation of acorrie, then explain that a

pyramidal peak is when 3 of theseare surrounding a peak. An

example of a pyramidal peak isthe Matterhorn.

First explain the formation of acorrie, then explain that a

pyramidal peak is when 3 of theseare surrounding a peak. An

example of a pyramidal peak isthe Matterhorn.


7/14

A river flows in asmall depression.

Eventually, vertical

erosion occurs,making a deeperdepression.

The sides of thevalley then

collapse

eventuallybecause the sideshave pressure put

on them.

This leaves the rivervalley a V shape

But when the riverfreezes, it expandsand erosion occurson both the valleywalls and floor due

to abrasion andplucking

(definitions).

This leaves a Ushaped valley.


8/14

River valleys often have

interlocking spurs, but whena glacier moves through

these, the spurs are cut off,making truncated spurs.


9/14

When iceerodes a

main valley,

it alsoerodes thetributaryvalleys .

However it willerode the larger

main valleymuch quicker

than It will erodethe smaller

tributary valley.

When the icemelts the

tributary valleyis left hanging

above themain valley.

It will then

cascadedown tothe main

valley as awaterfall.


10/14

Whenglaciersmove

througha valley,

theyerode

thebase byabrasion and

plucking.

For a

ribbonlake to beformed,the icehad to

erode inone part

of thevalley

more toform a

depression. This

could befor manyreasons.

Therock

couldhavebeensofter,so the

iceerodesdeeper

andmore

quickly.

The icecouldhave

erodedmore

becaus

e therewas asteepergradien

t.

It couldalso bebecaus

e oftributar

y

glaciersjoiningthe

mainone.

When

the icemelts alake is

formedin the

depression. This

maywell bedamned in by

terminalmoraine


11/14

They are made from boulder clay,and are usually between 30-40mhigh and about 300-400m long.

When the glacier meets an

obstruction, it deposits on one endof the obstruction (sharp end), itthen deposits the rest on the otherend, and the flow of ice over this

part shapes it (tapered end).

When the ice of a glacier starts tomelt, deposition starts to occur

because its ability to carry materialis reduced.


12/14

Cold.

Wet.

Lack of

sunshine.Snow.Soil onslopescouldhave

beeneroded byGlaciation

.

Land issteeper,

particularlyvalley sides.


13/14


14/14

Example- The Lake District

Footpath erosion is managed by diverting

the course of the footpath, laying downartificial footpaths, or fencing off footpathsto give them time to recover.

Damage to stone walls is solved bybuilding stiles.

People walking on the crops is solved byputting up warning notices.

Documents

GSCE Geography Glaciation