How do Glaciers Form and Move?
 On page 69, the text says that glaciers form
when snow piles up and the lower section
freezes into ice. If there is enough
pressure, the ice becomes “plasticlike” and
the whole mass begins to slowly move.
How does Ice Erode Rock?
 Looking at the Figure 9 illustration, I can
see that glaciers can pluck up rock from
below as it thaws and refreezes.
 From the reading, I know that the plucked
rocks and sediments on the bottom of the
glacier can create grooves and striations as
the materials scrape the surrounding soil
and bedrock.
How does Ice Deposit Sediment?
 One example of glacial deposition is till.
When a glacier begins to melt and shrink, it
drops sediment, boulders, clay, and silt (this
mixture is called till). In some cases, till
deposits filled entire valleys until they were
flat.
 Another example from the reading is
moraine deposits. A moraine is a ridge of
deposited materials from the edge of a
glacier.
 On page 71, the text describes outwash
deposits, which are materials deposited
from the meltwater of a glacier.
 An example of an outwash is an esker.
Eskers are formed when the ice melts and a
river channel is created within the glacier
that deposits a ridge of sand and gravel.
What are Continental Glaciers?
 Based on what I read, continental glaciers
are thick, huge masses of ice and snow that
once covered 28 percent of the earth,
including much of North America. You can
still find examples of continental glaciers
near the poles in Antarctica and Greenland.
What are Valley Glaciers?
 According to the text, valley glaciers occur
in high mountain ranges where snow does
not melt in the summertime. Valley glaciers
can erode as they move; they can create Ushaped valleys, bowl-shaped basins, long
ridges, and sharpened mountain peaks.
Why are Glaciers Important?
 On page 74, the text explains that glaciers
have eroded mountaintops, transformed
valleys, and deposited sediments. The
deposited sediments can be used for
construction purposes.