The cracking apart or melting of rock samples on the Planet's level is called weathering. Weathering is termed as the breakdown or dissolution of rocks and minerals on the Earth's surface.
Moisture, glaciers, soils, minerals, flora, wildlife, and weather patterns are all degradation factors.
The correct answer is A) Enlargement of the cracks occurs because water expands  when it freezes.
The water at the underground level when starts to freeze starts to change the shape and the pattern of water that means it gets to change in the shape of solid and the solid shape requires the place in the underground level. This space enlargement results in cracks on the earth's surface and due to this, the earth's surface starts expanding.
To know more about physical weathering, refer to the link below:
https://brainly.com/question/1956338