Which of the following activities is allowed in a buffer zone?

In the context of buffer zones, which are areas designed to limit exposure to chemicals and protect the environment from potential contaminants, shoveling soil is an activity that can be permitted under certain regulations. This task typically involves managing soil materials in a way that does not disturb the surrounding environment unduly or violate the safety protocols established for the buffer zone.

Planting new crops generally may not be allowed because it could introduce new variables or contaminants that compromise the integrity of the buffer zone. Using heavy machinery is often restricted within buffer zones due to its potential to compact soil or create disturbances that could lead to erosion or runoff. Fishing in nearby water bodies may also be discouraged as it introduces the risk of exposing aquatic life to chemical residues or pollutants, thus undermining the buffer zone's purpose of environmental protection.

In summary, shoveling soil aligns with the primary goal of buffer zones to manage and maintain soil properties without significantly harming the surrounding ecosystem, making it the appropriate activity among the provided options.