The zone of accumulation is the area where a glacier

This preview shows page 20 - 22 out of 22 pages.

The zone of accumulation is the area where a glacier forms Is located above the snowline Page 20 of 22
Image of page 20

Subscribe to view the full document.

o The zone of wastage is the area where there is a net loss of glacial ice Melting Calving: the breaking off of large pieces of ice (icebergs where the glacier has reached the sea) Glacial budget o The glacial budget is the balance, or lack of balance, between accumulation and loss of ice Loss of ice at the lower end of the glacier is called ablation If accumulation exceeds loss, the glacial front advances If ablation increases or accumulation decreases, the glacial front will retreat 3. Discuss the processes of glacial erosion. Identify and describe the major features created by glacial erosion. Glaciers erode the land primarily in two ways: As a glacier flows over a bedrock, it loosens and lifts blocks in a process called plucking Rocks in the glacier also act like sandpaper to smooth and polish a rock surface in a process called abrasion Glacial abrasion produces: Rock flour (pulverized rock) Glacial striations (grooves in the bedrock) Glacial erosion is controlled by: Rate of movement Thickness of the ice Types of rock fragments trapped in the ice The erodibility of the surface below the glacier Erosional features produced by valley glaciers include glacial troughs (a wider and deeper valley), hanging valleys (the valleys of tributary glaciers that are less standing above the main glacial trough), cirques (located at the head of a glacial Valley is this characteristic and often imposing feature associated with an Alpine glacier, It is the focal point of the glaciers growth), arêtes (sinuous and sharp edged ridges), horns (sharp pyramid-like peaks), and fjords (ice-sculpted inlets of the sea, example is the coast of Norway). 4. Distinguish between the two basic types of glacial drift. List and describe the major depositional features associated with glacial landscapes. Two basic types of glacial drift: Glacial till o Till is deposited as glacial ice melts and drops its load of rocks Glacial erratics are boulders in the till or lying on the surface Stratified drift o Sediment that is sorted by size and weight of the particles is called stratified drift Deposited by glacial meltwater rather than the glacier itself The most widespread features created by glacial deposition are layers or ridges of till, called moraines. Associated with valley glaciers are lateral moraines o formed along the sides of the valley medial moraines o formed between to valley glaciers that have emerged end moraines o which mark the former position of the front of the glacier ground moraines o undulating layers of till deposited as the ice front retreats o Are common to both valley glaciers and ice sheets Page 21 of 22
Image of page 21
5. Describe and explain several important effects of Ice Age glaciers other than erosional and depositional landforms.
Image of page 22
  • Spring '10
  • HEADD
  • Geology, Glacier, glacial ice,  Glaciers

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern