5. Road cave-ins have been a recurring issue in urban areas across India, posing significant challenges to infrastructure and public safety. With reference to road cave-ins, consider the following statements:
- The cave-ins or cavities that appear on roads are primarily caused by the erosion of soil underneath the road surface.
- Heavy rainfall, leakage from water pipelines, and improper road construction techniques can contribute to road cave-ins.
- Road cave-ins are more common in rural areas compared to urban areas.
- The use of copper slag in rural road construction helps reduce the risk of cave-ins and ensures environmental sustainability.
Which of the statements given above is/are correct?