The management and modification of natural environment or wilderness into built environment.

The state of matter in which a substance is in liquid form as opposed to solid or gas.

A method of ensuring that machinery or equipment is secured and cannot be operated.

A safety procedure used to ensure that dangerous equipment is properly shut off and not started up again prior to the completion of maintenance or servicing work.

A substance (often a liquid) applied to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move.

The process of applying a lubricant to reduce wear and friction between two surfaces.

A source of light, often used in the context of safety and visibility in environmental engineering projects.