S3 Geog Landslides(U5.4)

Which of the followings is/are moved down the slope?

• Sand

• Dust

• Muddy water

• Rock debris

Slope XY is 1.8cm on a map with the scale of 1:10,000. The vertical rise is 10m. What is the gradient? 

Note: You don't need to use a calculator, the mathematical answers are correct.

•  $\frac{vertical}{horizontal}=\frac{10}{1.8m\times10,000cm}=\frac{1}{1800}$  

•  $\frac{horizontal}{vertical}=\frac{1.8m\times\frac{10,000cm}{100}}{100}=\frac{1}{0.56}$  

•  $\frac{horizontal}{vertical}=\frac{1.8m\times10,000cm}{100}=\frac{1}{180}$  

•  $\frac{vertical}{horizontal}=\frac{10}{1.8m\times\frac{10,000cm}{100}}=\frac{1}{18}$  

Which of the followings is/are not the effect of landslides?

• Flooding

• Earthquake

• Disrupt traffic

• Heavy rain

Shear strength is influenced by two forces, other than friction, what is the other force?

What force is shear stress influenced by?

Slope A has a gradient of $\frac{500m}{500m}=\frac{1}{1}$ , and slope B has a gradient of  $\frac{250m}{500m}=\frac{1}{2}$  . Which Slope is steeper? 

• Slope A

• Slope B

Which of the followings is/are not the natural factors of landslides?

• Steep slopes

• Cutting slopes

• Farming on slopes

• Heavy rainfalls

How does cutting slope increase the risk of having landslides?

• It reduces the vegetation

• It reduces the slope materials

• It increases the gradient

• It increases the surface area for water to seep into

How does weathered materials increase the risk of having landslides?

• They reduce the cohesion of slope materials

• They increase the gap between rocks and soils and allow water to seep in

• They reduce the vegetation on slopes

• They increase the gradient of the slope

Which of the following is/are the reasons for why heavy rain increases the risk of having landslides instantly?

• It increases the weight of slope materials

• It reduces shear stress

• It helps weather slope materials

• It reduces the cohesion of slope materials