A(n) outrigger is a structure that extends from the platform of a mobile crane and contacts the ground.

An outrigger is indeed a structural component that extends from the platform of a mobile crane to provide additional stability by distributing the load over a larger area. By reaching down to the ground, outriggers help prevent tipping or instability during lifting operations, which is crucial for safe crane operation. They enhance the crane's capacity to lift heavy loads by increasing the base of support, allowing for greater safety and performance.

In the context of mobile cranes, using outriggers is standard practice to secure the crane while it is in use, making the statement about outriggers being a structure that extends from the platform of a mobile crane and contacts the ground accurate. This reinforces the importance of understanding crane dynamics and the role that outriggers play in ensuring the safety and efficacy of lifting operations.