51. What is the name for the zone at the bottom of a glacier where melting and refreezing occur?
a) Zone of accumulation
b) Zone of ablation
c) Zone of plastic deformation
d) Zone of basal sliding
52. Which of the following is not a type of glacial moraine?
a) Terminal moraine
b) Medial moraine
c) Lateral moraine
d) Ablation moraine
53. What is the name for the process by which glaciers change the shape of the landscape through erosion and deposition?
a) Glacial plucking
b) Glacial abrasion
c) Glacial deposition
d) Glacial sculpting
54. Which of the following is a type of glacier that ends in the ocean and calves icebergs?
a) Alpine glacier
b) Continental glacier
c) Hanging glacier
d) Tidewater glacier
55. What is the name for the process by which glaciers melt and sublimate faster than they accumulate snow and ice?
a) Positive mass balance
b) Negative mass balance
c) Equilibrium mass balance
d) Dynamic mass balance
