Geology Chapter 12 (1)

pdf

School

California State University, Sacramento *

*We aren’t endorsed by this school

Course

10

Subject

Geography

Date

Apr 3, 2024

Type

pdf

Pages

2

Uploaded by danielalramos

Report
1. How do features caused by stream erosion differ from features caused by glacial erosion? Mountains formed by streams have rounded tops, while those formed by glaciers have angular peaks. 2. How does material deposited by glaciers differ from material deposited by streams? What is the name of a rock formed from this material? Glacial sediments are unsorted and unstratified, while stream deposits are sorted and stratified. 3. How would you distinguish an alpine glaciated terrain from a continental glaciated terrain? You could distinguish an Alpine glaciated terrain from a continental glaciated terrain because an alpine glaciation is found on mountainous regions and a continental glaciation exists where a large part of a continent is covered by glacial ice. 4. Describe the glacial erosion processes of plucking and abrasion. What features indicate these processes have occurred in the past? Plucking is the process by which a glacier picks up a rock as it flows over the land and abrasion is the process by which glacier's gouge and scratch bedrock. 5. Describe how arêtes, cirques, and horns form. Cirques are bowl-shape depression at head of glacial valley surrounded on 3 sides by steep rock walls, arete are snaking, sharp-edged ridge and, horns are sharp pyramid-like peak. 6. How does the glacial budget control the migration of the equilibrium line? When new snow is greater than melting. the glacier advances. when melting is greater than new snow, it retreats. 7. How do recessional moraines differ from terminal moraines? Recessional moraines are the end moraines that form when the ice front occasionally becomes stationary during its retreat and terminal moraines are the farthest end moraine. 8. How do kettles, eskers, and drumlins form? Kettles form when blocks of stagnant ice become buried in drift and eventually melt. Eskers are composed of sand and gravel that were once deposited by streams once flowing in tunnels beneath glaciers. In drumlins the steep side of the hill faces the direction the ice came in from, and the gentler lope points in the direction the ice moved. 9. Alpine glaciation c. is found in mountainous regions. 10. Continental glaciation d. exists where a large part of a continent is covered by glacial ice. 11. At present, about _____% of the land surface of the Earth is covered by glaciers. d.10 12. Which is not a type of glacier? d. peak glacier 13. The boundary between the zone of accumulation and the zone of ablation of a glacier is called the b. equilibrium line.
14. In a receding glacier, b. the terminus moves upvalley. 15. In the interior of a glacier, beneath the rigid zone, movement occurs by b. plastic flow. 16. How fast does the central part of a valley glacier move compared to the sides of the glacier? a. Faster 17. Glacially carved valleys are usually _____ shaped. b. U 18. Which is not a type of moraine? e. esker 19. The last episode of extensive glaciation in North America was at its peak about _____ years ago. d. 18,000 20. During the ice ages, much of Nevada, Utah, and eastern California was covered by a. ice.
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help