Large cracks in rocks are called, fracture or fissure.
a Fault line
Veins
fractures
Faults
Ice wedging
The water continuously freezes and thaws eventually splitting the rock into pieces creating sand.
This may be a fault breccia or cataclasite which is formed by the fracturing of rocks during fault movement.
As the water freezes in the cracks of rocks,the cracks expand. The process repeats itself and the rock eventually breaks.
Faults
Cleavage is the splitting of rocks or minerals along defined surfaces.
They are called bedding planes
sounds like, if the rocks are plates, an earthquake... assuming this "crack" is a fault?? does this help?
erosion
Movement of rocks along large cracks in the Earth's crust.
cracks open wider
ice wedges
cracks open wider
Ice wedging
Ice wedging
dike