lol Flashcards

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1
Q

how are glaciers formed

A
  • layers of snow fall on top of each other
  • layers get compacted into ice
  • can need 10 metres of snow to make 1 metre of ice
  • happens over hundreds of years
  • also contain rock + sediment + running water ( if melting near the surface)
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2
Q

how do glaciers move

A
  • ice gets thicker → much heavier
  • weight forces glacier to move
  • flow like water
  • ice crystals slide over each other or ice melts and allows
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3
Q

what’s an alpine glacier

A
  • form on mountain side
  • move downwards through valleys
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4
Q

what’s an ice sheet glacier

A
  • cover everything around them with a thick layer of ice
  • form broad domes
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5
Q

when do glaciers stop “flowing”

A

until they melt or reach the sea

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6
Q

when a glacier breaks out in the sea what does it become

A

an iceberg

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7
Q

what move faster alpine or ice sheet glaciers

A

alpine glaciers due to gravity

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8
Q

when did the last ice age end

A

10,000 years ago

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9
Q

what are periods of time between glacial periods called

A

interglacials

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10
Q

define freeze thaw weathering

A

when water gets into the crack of a rock then freezes and expands causing the crack to get bigger until the rock splits

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11
Q

what are the three distinctive features of a corrie

A
  • steep back wall
  • over-deepened hollow
  • lip
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