Every year, in the USA, landslides cause approximately $3.5 billion in damage, and kill between 25 and 50 people.
Landslides can vary in size, from as small as a single boulder to as large as thousands of tonnes of earth and debris.
In Canada, a landslide moved a river bank as fast as 680m in less than half an hour.
Volcanic eruptions can cause horrible landslides.
There are many signs that a slow revealing landslide is happening; Cracks in the plaster, windows jam for the first time etc.
Another name for landslides are mudslides and mass effect.
The fastest landslide ever recorded went an amazing 186 miles an hour!
One of the largest landslides ever went over 9 miles in only a few minutes!
Landslides often accompany earthquakes, floods, storm surges, hurricanes, wildfires, or volcanic activity. Landslides usually are less damaging and deadly than the triggering event, but usually cost the nation more money to fix the problems created by it.
They usually start on steep hillsides as shallow landslides that liquefy and accelerate to speeds that are typically about 10 miles per hour, but can exceed 35 miles per hour.
The consistency of debris flows ranges of watery mud to thick, rocky mud that can carry large items such as boulders, trees, and car.