Periglacial processes - Mass movement Flashcards

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1
Q

Give three mass movement periglacial processes?

A
  • Frost creep
  • Solifluction / gelifluction
  • Rockfalls
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2
Q

Describe the process of frost creep?

A

The net downward displacement which occurs when rock and soil particles expand at 90 degrees to the surface during freezing and fall down to the ground vertically on thawing.

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3
Q

Which features are associated with frost creep?

A

Unstratified ‘drift’ deposits on lower parts of valley side slopes.

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4
Q

Describe the process of solifluction?

A

The slow, downslope movement water-saturated soil. As this definition is not confined to cold climates, the more specific term gelifluction is used to describe solifluction associated with frozen ground.

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5
Q

Give some features associated with solifluction / gelifluction?

A
  • Solifluction lobes
  • Terraces
  • Head deposits
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6
Q

Describe the process of rockfalls?

A

The free fall of rock detached by freeze-thaw weathering to the base of the base of a steep slope.

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7
Q

Give some features associated with rockfalls?

A
  • Scree
  • Pro-talus rampart
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