Natural disasters associated with land use changes and community growth is becoming more frequent in many regions of the world. A large percentage of the damage to property and loss of life is related to ignorance of local geologic and environmental risk factors resulting in uninformed building site choices. Watch the following video footage from the 2003 Devore, CA disaster by cutting and pasting the following link into your web browser (https://www.youtube.com/watch?v=k3W-wDIR-Os).

1.) How would you characterize the natural disaster in Devore, CA from the images you saw? Consider what the dominant mechanism must have been to generate the level of damage observed. You may want to refer to Chapter 12 in the book for ideas and/or clarification.

2.) Describe the maximum, minimum, and average (approximate) clast size being moved in the video. (Refer to the clast size designations we used in lecture as a guide.) What is the relationship between clast size and the energy required to overcome the coefficient of static friction?