Book 20, Question 103
Why Does a Whole Layer of Snow Sometimes Let Go and Slide?
Sometimes a whole layer of snow lets go because it is sitting on a weak layer underneath. When it slides all at once, that is called an avalanche. Let's talk about it calmly, because understanding it helps keep people safe.
More fun facts
- A slab avalanche starts when a weak layer of snow collapses.
- The snow on top cracks and starts to slide.
- A quick dump of new snow can overload a weak layer.
- Warm spring weather or rain can cause wet snow slides.
- Some landscapes produce many avalanches year after year.
Sources: National Geographic, National Geographic
Questions kids ask
What starts a slab avalanche?
A weak layer of snow collapses, and the snow on top cracks and slides.