glacial deposition - landforms Flashcards
lateral moraine
deposited where the sides of the glacier once were
much of the moraine will have freeze thaw weathering acting on the valley sides
medial morraine
the medial morraine is deposited in the centre of the valley where two glaciers meet/converg
medieal morraine is two lateral moraines joined together, made from weathered material of the valley sides.
its found in lines parallel to the ice flow
terminal moraine
- builds up at the end of the glacier in semi-circular hillocks of till
- it is highly likely that streams of meltwater will have cut the semi-circle into a series of hills
- ## these hills will be steeper on the upglacier side as the glacier woulf have deposited more material there once the hill had started to fomm
recessional moraine
recessional moraines are often found in lines behind the terminal moraine
- a terminal moraine .
- shows the movent of the eglaciers snout duting shorter periods of change when the melting of the glacier slowed down
drumlinnnn
area previously covered in ice
- can be 1500m long and 100m high
- have parralel orientation to the directio of glacial flow
- they occer in large clusters known as swarms
- the upglacier (stoss) end is wide and tall
- the downglacier (lee) is narrow and low
how drumlin was formed
it is unclear how they were formed
one theroy suggests that till may have gotten stuck around a rock or small hill sticking out into the glacier. when the ice readvanced over it, it streamlinedthe original mound of dropped till