What is an example of freeze-thaw weathering?

Answer 1

Any porous material in a temperate area may be subject to this type of weathering.
You often see slabs of stone which have 'exfoliated' from the face of a cliff above.
You will see cracks in ledges that are wider near the surface than they are further into the crack. (It makes some formations look like they could be structures made by man a long time ago.)
In both cases water has seeped into the material and expanded at night when the temperature drops.
In the first case the freezing extended the cracks to the point that the rock slab became detached from the main structure and fell to the base of the cliff.
In the second case, because the structure is more stable to start with, the cracks just get deeper and deeper. During the process the grains and crystals in the rock absorb water into the microscopic seams between them. When freezing occurs in this case tiny grains and crystals are broken loose and fall away. Those near the surface are exposed for the longest amount of time so more of them are removed making that part of the crack wider.
Between these two extremes are any numbers of cases where rock fragments have been split away from the base material.

Answer 2

My front steps (made of brick)...

Liquid water seeps into tiny cracks. The temperature drops and the water freezes into ice. Ice is less dense than liquid water (that's why it floats), so freezing water expands. The expansion forces the crack to get larger. Repeat the process, and eventually the Old Man Of The Mountain crashes into Franconia Notch.

Answer 3

a crack
because when it rains the water gets in the crack and then when it freezes it expands causing the crack to widen
this can happen multiple times making it bigger and bigger

Answer 4

How about Candle ice?

Answer 5

the pothole in front of my house?