GEOL 101 Quiz #13
Name: ________________________
Physical Geology Fall 2023, CSN
Oso, WA Mass Wasting Event
Instructor; Alex Sánchez
Factors that triggered the mass wasting event at Oso, Washington on March 22,
2014. Be sure to review the slides on CANVAS for the “Mass Wasting” lecture.
Answer TRUE or FALSE (2 pts. each)
1.
Over steepened slopes caused by fluvial activity creating a valley. _____
2.
Extra weight added to the top of the slope in the form of water due to more-than-
normal amounts of rainfall. _____
3.
Removal vegetation due to logging, which protected rock/soil from heavy rainfall and
added strength to soils with roots. _____
4.
Removal of material from the bottom or middle of the slope (undercutting) by erosion
due to fluvial activity. _____
5.
Earthquakes caused by tectonic and volcanic activity. _____
6.
Rock type that was weak due to poorly consolidated sediments. _____
7.
Past history of mass wasting events in the area. _____
You may either edit this document or print and scan (take a picture) and return it via a
CANVAS message or directly to
alex.sanchez@csn.edu
due date is due 11:00 AM Monday, November 27, 2023
