Unit 46: Periglacial Environments and Landscapes
Teacher Questions:
1) Areas that are near-glacial or on the perimeter of glaciation is termed:
a) glacial
b) interglacial
c) periglacial *
d) permafrost
2) The permafrost layer typically begins between _____ below the surface.
a) 0 to 15 cm
b) 15 cm to 5 m *
c) 5 m to 15 m
d) 5 cm to 15 cm
3) The upper surface of the permafrost is called the:
a) permafrost table *
b) ice sheet
c) frozen mud
d) snow layer
4) All of the following influence the thickness of the active layer EXCEPT:
a) soil texture
b) vegetation cover
c) local climate conditions
d) depth of snow in summer *
5) The permafrost has the ability to keep thickening season after season in high-latitude
areas. Which factor limits this thickening process?
a) warm temperatures during the summer
b) the angle of the sun
c) Earth’s interior heat *
d) none of the above
6) Another name for frost action is:
a) frost wedging *
b) freezing action
c) frost heaving
d) frost creep
7) Freezing and thawing of water can dislodge large boulders from cliffs
a) True *
b) False
8) When rocks are moved upward within the active layer above the permafrost, it is
undergoing _____ that is triggered by the expanding of ice in the ground.
a) frost wedging
b) frost heaving *
c) frost thrusting
d) frost creep
9) _____ is the slow downslope movement of particles above the permafrost under the
influence of gravity.
a) frost wedging
b) frost heaving
c) frost thrusting
d) frost creep *
10) All are terms that describe an area made up of blocky rock fragments formed from the
mechanical breakdown of bedrock by repeated freezing and thawing EXCEPT:
a) ice-wedge polygons
b) patterned ground
c) pingos
d) boulder fields *
11) The construction of different shapes of periglacial rock and soil debris within the
periglacial zone are known as:
a) ice-wedge polygons
b) patterned ground *
c) pingos
d) boulder fields