1.  What is the percentage of air in snow at the top of the glacier? __90%___

2.  What causes snowflakes to get closer to each other? _________________

_____subsequent snowfall layers compact flakes_______________

3.  What is the percentage of air in snow after it has been compacted? _50%

4.  What happens to the ice crystals as snow accumulates year after year? 

_ice crystals become more compressed and air spaces between crystals shrink_

5.  What is the percentage of air in the ice at its densest? __10%______

6.  What causes the ice crystal to make its journey through the glacier? 

___tremendous pressure from weight of the ice above_____

7.  How is a warm glacier similar to an ice skate? _____________________

__weight of ice creates thin layer of liquid water over which the glacier slides __________

8.  Which moves faster, a warm glacier or a cold glacier?  What factors 

affect the flow? ____warm glacier moves faster.  Other factors – size, ____

___pitch of slope, temperature of ice________________________

9.  Describe two ways in which glaciers lose their mass.

___calving (icebergs break off into ocean), melting, sublimation (water

___changes directly from solid into gas)_____________________