Question

Table 1. Landscape Features and Geologic Setting Observations: Read the descriptions in your textbook (Chapter 15 Investigation) about this place and think about what the descriptions imply about the slope stability and other geologic aspects. Processes: On Table 2. identify the type of slope failure or soil process that is most likely at each site. On the figure, draw approximate boundaries around areas that you interpret as having the highest risk for that type of slope failure. Label each area with a few words to identify the main hazard you interpret to be present. Write your answers in Table 2. Safe Place to Live: On the map, write the letter (S) for the safest place and (N) for the next safest. There is not a single best choice, but be prepared to describe your reasoning and defend your choice.

Answer 1

1- It contain trees that are tipped over at odd angles. This feature is called creep. Its not the area for habitation. Debris flow can occur here.

2- Formed by resistant rocks of basalt. The jointed rocks are known as columnar joints. These are high angle rock bodies and rock fall can happen.

3- It is snow capped steep mountain with no such evidence of recent volcanism but fumes occasionally rises from the central crater. Rock, debris or snow avalanche can happen here. Debris avalanche because the mountain has got association with mud in its right flank.

4- These are large mass of rocks and other debris with hummocky topography. This debris cut across paths of streams originating from adjacent hills. Since this area is devoid of trees and soil only rock slide is dominant not debris flow or debris slide.

5- Gray mountains have wide spaced fractured planes of granite. They dip opposite the mountain and is prone to rock slide landslide, due to the fracture planes present.

6- It is an area of volcanic ash that has weathered to form clay, thats why its topography is undulating due to swelling and compacting of soil. The soil absorb water and evaporate them which makes the topography bumpy and fractures can be seen here.

7- It is a tilted limestone hill, terraces can be seen so this area is prone to debris slide, slump, and rock slide during rainy season as water percolates the soil and dissolves the calcium carbonate - present and weaken the rock layers.

8- The cliff at base is steep enough for rock fall. At the base of the tilted limestone hill chaotically scattered blocks of rocks can be seen which is not part of the underlying topography. Clearly it has dropped from the hill which makes it certain that rock fall has happened.

9- It is relatively safe zone for habitation, as the topography is smooth and the river is flowing below the topography, the river don't seem to carry enough water because if had carried this area would have been prone to seasonal flood.

у М