Why is crushed rock used around equipment?

The correct answer to why crushed rock is used around equipment is to facilitate drainage.

Using crushed rock helps manage water runoff and decrease the accumulation of water around equipment. Proper drainage is essential for preventing water from pooling, which can lead to various problems such as equipment rust, malfunction, or unstable ground conditions. Crushed rock provides a permeable surface that allows water to flow through, minimizing mud and sediment that can cause hazards.

The other options mention factors like electrical resistance and aesthetics, which are not primary reasons for using crushed rock. While preventing equipment movement could be a consideration in some contexts, the primary function of crushed rock in this scenario is related to effective drainage management.