What effect would adding water (h2o) have on this reaction over time? (nh4)2co3(s) ⇌ 2nh3(g) +co2(g) +h2o(g)

Answer is: the position of equilibrium will move to the left.

Balanced chemical reaction: (NH₄)₂CO₃ ⇄ 2NH₃ + CO₂ + H₂O.

According to Le Chatelier's Principle the position of equilibrium moves to counteract the change.

The position of equilibrium will move so that the concentration of water decreases again by reacting it with ammonia and carbon dioxide.

it's all four options.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.