Final answer:
Landslides are a widespread geologic hazard that pose a significant risk to populated areas. They occur in connection with various natural disasters and can be triggered by weak or fractured materials on steep slopes.
Step-by-step explanation:
Landslides are a major geologic hazard that occur in all 50 states and U.S. territories. They typically happen in areas with weak or fractured materials on steep slopes. Landslides are often triggered by natural disasters like earthquakes, volcanoes, wildfires, and floods. The expansion of urban and recreational developments into hilly areas increases the threat of landslides to people.