Glaciation 2

Question 1

Striations?

Answer 1

As a glacier moves across and area of exposed rock, larger fragments of angular debris embedded in the ice tend to leave a series of parallel scratches and grooves called straitions

Question 2

Rock drumlin

Answer 2

Smooth elongated mounds of till that run parallel to ice flow movement

Question 3

Till

Answer 3

An unsorted mixture or rocks Clays and sands

Question 4

Moraine?

Answer 4

Type of landform that develops when the debris carried by a glacier is deposited

Question 5

Lateral moraine

Answer 5

Formed from debris from frost shattering of valley sides and is carried along edges of glacier . When the glacier melts, it leaves an embankment of material along the valley side

Question 6

Medial moraine

Answer 6

Found in the centre of the valley and results from the merging of two lateral moraines where two glaciers joined

Question 7

Terminal moraine

Answer 7

High mound of material extending across a valley or lowland area, at right angles to and marking the maximum advance of the glacier or ice sheet

Question 8

Recessional moraine

Answer 8

Marks areas where glacier stopped retreating and remained stationary long enough for a mound to build up, which usually are parallel to terminal moraine

Question 9

Push moraine

Answer 9

Temporary changes in climate allowed ice to advance again

Question 10

Outwash plains

Answer 10

Is a plain formed by glacial sediments and are deposited by meltwater past maximum extent of ice

Question 11

Kame?

Answer 11

Well sorted, undulating mounds made of sand and gravel deposited by melt water

Question 12

Esker

Answer 12

Long narrow ridges made of sorted sand and gravel
Formed during times of deglaciation
Fossilized courses of sub glacial melt water streams
Bed of meltwater channel builds up because no flood plain exists under high pressure below glacier

Question 13

Kettle

Answer 13

Blocks of ice detach from glacier as it retreats
Ice is partially buried by glacifluvial deposits fro meltwater
When ice melts, it leaves an enclosed depression which fills with water

Question 14

Eustatic adjustment

Answer 14

World wide fall or rise in sea level due to changes in hydrological cycle, caused by water being held in storage on land in ice sheets or released following the melting of ice sheets

Question 15

Isostatic adjustment

Answer 15

Local change in sea level resulting from depression or uplift of the earths crust by increased or decreased weight imposed upon it by the ice sheets.