Question

what is a potential consequence of subsurface mining when the mines are abandoned? increased agricultural productivity decreased water pollution subsidence and sinkholes increased biodiversity

Explanation:

Subsurface mining can cause structural damage to the ground. When mines are abandoned, the removed material leaves voids. These voids can lead to the ground sinking (subsidence) and the formation of sinkholes. Agricultural productivity is usually decreased due to soil and water - quality issues related to mining. Water pollution often increases as mining waste can contaminate water sources. Biodiversity is typically decreased as habitats are disrupted.

Answer:

subsidence and sinkholes