We know, we know. Potholes seem like the only thing we talk about here at SeeClickFix. However, we've never actually discussed the origins of these nuisances. Well, you're in luck! Yesterday, I came across this article from Popular Mechanics that breaks down how these road craters form. The process starts with one small crack, which then fills with water. After the water freezes, the crack expands and the water pushes the asphalt outward and upward.
It starts slowly at a weak spot, and once it starts falling apart, that creates larger cracks; then more water gets into it, and the cracks grow larger.
When you step on a dry yard, you don't leave any indentation because it's hard and it fully supports your weight. But when it gets wet, your shoe sinks down in it.