Glaciers: worksheet
Name______________________________
1. A glacier is a mass of land ______________ consisting largely of recrystallized __________________.
2. Glaciers originate in __________________ above the _______________________________.
3. The latitude of the mountain largely determines the position of the ____________________.
4. Granular ice called _______________ may be compressed to form _________________ ice.
5. Glaciers move downslope in response to ___________________________.
6. Glaciers originating in snowfields at the heads of mountain valleys are called ____________________ or
__________________ glaciers.
7. The typical glaciated valley is __________________ shaped.
8. When two valley glaciers unite, a _______________________ glacier may be formed.
9. The largest glacier on Earth almost completely covers the continent of __________________________.
10. The largest glaciers are called ________________________ or ___________________________.
11. A glacier flowing down a steep slope will move ___________________ than one on a more level surface.
12. The more plastic ice is in the glacier’s zone of _________________________.
13. Deep cracks called _________________ may develop in the brittle ice in the zone of _______________.
14. When glaciers reach areas of higher temperature they begin to _________________________.
15. Blocks of ice that float out to sea are called ________________________.
16. The process whereby rocks are eroded by glaciers is called ______________________________.
17. Steep-walled, semicircular depressions called _______________________ may develop near the head of a
valley glacier.
18. A mountainous, isolated, pyramid-shaped mass of glaciated rock is a _______________________.
19. When a glacial valley is invaded by the sea, a _____________________ is formed.
20. Sediments deposited by glaciers are collectively known as _____________________________.
21. Nonstratified glacial sediment is known as _______________________________.
22. Outwash consists of sediment deposited by the action of glacial _____________________________.
23. Streamlined, elongated hills composed of till are called _________________________________.
24. A serpentinelike ridge is called an __________________ and is composed of __________________
deposited by a stream flowing along the bottom of a glacier.
25. Ice-transported boulders found far from their place of origin are called glacial ___________________.
26. The Earth is about __________________ years old.
27. The so-called Great Ice Age occurred during the _____________________ Epoch which began about
_______________________ million years ago.
28. The percentage of North America that was covered by glaciers during the Great Ice Age is estimated to be
about _____________________%.
29. The remnant of an Ice Age lake known as Lake Bonneville is now called ___________________________.
30. The ice front receded during the ______________________ periods of the Ice Age.
31. The true cause of glacial climates and ice ages is ________________________________.
32. Changes in solar radiation may have been made by variations in ____________________ which caused
temperatures to be ____________________ on Earth.
33. The theory that states the sea floors are spreading and continents have moved position compared to their
position in the geologic past is known as ______________________________________.