F.2 Landslides

What is a landslide?

• The movement of water and sediment down a slope.

• The movement of rock and earth down a slope without a moving agent.

• A type of bridge that collapses under weight.

• The gradual wearing away of rocks by wind and rain.

What is the main cause of landslides?

• Wind erosion

• Gravity pulling material downslope

• Volcanic eruptions

• Human activity

Which months in Hong Kong experience many typhoons that can lead to landslides?

• January, February, and March

• April, May, and June

• July, August, and September

• October, November, and December

What type of weather caused by the typhoons in Hong Kong leads to landslides?

• Heavy rain

• Extreme heat

• Sudden temperature drops

• Strong winds

Why does the land use for residential and commercial buildings in Hong Kong contribute to landslides?

• It improves drainage on the slopes.

• It reduces the slope angle.

• It increases the slope material's weight.

• It adds vegetation to the slopes.

How can the wind affect the stability of slope material?

• The wind can blow away loose material, making the slope more stable.

• The wind can push and pull at trees, making the slope material less stable.

• The wind can cool the slope material, making it more stable.

• The wind can increase the amount of vegetation on the slope, stabilizing it.

What effect can building roads on slopes have?

• It decreases the slope angle, making the slope more stable.

• It adds more weight to the slope, increasing stability.

• It improves drainage on the slope, reducing landslide risk.

• It cuts into the slope, making it steeper and less stable.

Organize these options into the right categories.

Groups:

(a) Preventive Measures

,

(b) Remedial Measures

• Land use planning

• Regular maintenance

• Engineering works

• Setting up warning systems

• 6. Emergency relief

• Slope rehabilitation

• Education

What is this?

• Weep hole

• Soil nail

• Retaining wall

• Rigid barrier

What is this symbol used for?

• To warn people that there might be a landslide.

• To warn people that there might be a volcanic eruption.

• To warn people that there might be a construction nearby.

• To warn people that there might be a bouldering activity.