Which type of surface is NOT appropriate for playgrounds?

Concrete is not an appropriate surface for playgrounds because it poses significant safety risks for children. In the event of a fall or accident, concrete does not provide any cushioning, increasing the likelihood of serious injuries such as fractures or concussions.

In contrast, the other surfaces—sand, recycled rubber, and engineered wood fibers—are designed to absorb impact and reduce the severity of injuries. Sand provides a softer surface that can help cushion falls. Recycled rubber is often used for its durability and shock-absorbing qualities, making it a safer option. Similarly, engineered wood fibers are specifically designed to provide a safe and compliant surface for play areas, offering good shock absorption while being environmentally friendly. These characteristics make them suitable and effective for playground surfaces, prioritizing the safety of children during play.