In cold climates, ice also penetrates into the stone and the freeze-thaw cycle adds physical weathering to the chemical attack (recall that water expands upon freezing, which pushes the cracks open even further).
(ice; penetrates; into the stone; L:In cold climates) (the cracks; open; L:even further) (the freeze-thaw cycle; adds; physical weathering; to the chemical attack) (freezing; pushes; the cracks)
ice the cracks the freeze-thaw cycle freezing
penetrates open adds pushes
into the stone L:In cold climates
L:even further
physical weathering to the chemical attack
the cracks