Landslides: Causes and Impacts

The video discusses landslides, a natural disaster that reshapes the Earth's surface. Landslides can occur due to rain, gravity, or human activities, causing significant destruction and loss of life. The video highlights two case studies: the 1998 Laguna Niguel landslide in California and the 1999 Vargas landslides in Venezuela, emphasizing the unpredictability and devastating impact of such events.

What natural event caused the mountain to move in Portland, Oregon in February 1996?

• Flood

• Earthquake

• Landslide

• Volcanic eruption

What is one of the major reasons the surface of our planet is constantly reshaping itself?

• Wind erosion

• Human construction

• Landslides

• Animal activities

Which of the following is NOT a natural disaster that usually precedes landslides?

• Tornadoes

• Volcanic eruptions

• Earthquakes

• Wildfires

What human activity can increase the frequency and destructiveness of landslides?

• Fishing

• Planting trees

• Building roads and buildings on slopes

• Mining

In 1998, which Southern California suburb experienced a significant landslide?

• San Diego

• Los Angeles

• San Francisco

• Laguna Niguel

What was the primary cause of the 1998 landslide in Laguna Niguel?

• Wildfire

• Volcanic eruption

• Heavy rains

• Earthquake

Approximately how many people were killed in the 1999 landslide in Vargas, Venezuela?

• 10,000

• 20,000

• 30,000

• 40,000

What percentage of the population in the affected area of Vargas, Venezuela, was killed in the 1999 landslide?

• 20%

• 5%

• 10%

• 15%

What made it difficult to establish accurate death tolls in the Vargas, Venezuela landslide?

• Government cover-up

• Lack of communication

• People vanished under the mud or were swept out to sea

• Inaccurate census data

What is the ongoing threat as long as the earth continues to move?

• Floods

• Landslides

• Volcanic eruptions

• Earthquakes