54. An animal digs a burrow under a rock, which over time causes the rock to crack and split. Which process is occurring?
Answer: C
Physical weathering is occurring.
The process being described is physical weathering, which involves the breaking down of rocks into smaller pieces without changing their chemical composition. The action of the animal digging a burrow leads to physical changes in the rock structure, resulting in cracks and splits.
A) Chemical weathering
Chemical weathering involves the alteration of the chemical composition of rocks, typically through reactions with water, acids, or other chemicals. In this scenario, the rock is not undergoing any chemical changes; rather, it is physically being disrupted by the burrowing animal, making this option incorrect.
B) Erosion
Erosion refers to the process of moving soil and rock from one location to another, often caused by wind, water, or ice. While the animal’s burrowing might contribute to soil movement, the specific action of cracking and splitting the rock itself is a result of physical weathering rather than erosion, thus making this option incorrect.
C) Physical weathering
Physical weathering is characterized by the mechanical breakdown of rocks into smaller pieces without altering their chemical structure. The burrowing of the animal creates physical stress on the rock, leading to cracks and splits, which is a classic example of physical weathering.
D) Deposition
Deposition is the process where sediments and materials are laid down in a new location, often after being transported by erosion. This does not apply to the scenario described, as there is no mention of materials being deposited; instead, the focus is on the physical changes to the rock itself due to burrowing, making this option incorrect.
Conclusion
Physical weathering is the definitive process occurring in this scenario, as the action of the animal digging directly leads to mechanical changes in the rock. The other options either misinterpret the nature of the changes happening to the rock or refer to different geological processes entirely. Thus, physical weathering stands as the accurate explanation for the described phenomenon.