Rocks expand and contract depending on the temperature. After repeated exposure to temperature cycles, the surface of a rock may experience weakness in the bonds between crystals or particles, causing a delamination of the outer layer.
Water seeps into the rock, and when it freezes, it expands. When it heats up again, the water goes farther into the rock, and so on until the rock breaks.
Changes in temperature cause rock to expand and contract. This may cause them to crack, and pieces may break off.
The temperature heats the rock and breaks it (erodes).
Thermal expansion is the process by which rocks are cracked due temperature difference at night and morning....
Fragmentation clastic sedimentary rock is formed by the lithification of inorganic and/or organic sediments.
Sedimentary rock is formed generally at low temperature and pressure conditions.Therefore a change in this conditions to higher levels triggers mineralogical change.The driving forces for metamorphism are changes in temperature, pressure, and composition of the environment or strong deformation.These changes cause recrystallization in the solid state as the rock changes toward equilibrium with the new environment.Hence, formation of metamorphic rocks.
A "metamorphic" rock forms.
Weathering and erosion would alter the shape of a rock, as would the application of stress possibly combined with high(er) temperature conditions.
metamorphic rock metamorphic rock, or metamorphism
Wind, water, chemical, temperature changes,
Weathering
Metamorphism involves temperature and high pressure and chemical changes. The high pressure, chemical changes and temperature are the metamorphism that act on a rock that makes it change.