Stella has poured 3 cups of water into a 1-l soda bottle. stella then sealed the bottle and placed it in the sunlight. what natural process can stella study with the model she built?   a.  water cycle  b.  nitrogen cycle  c.  rock cycle  d.  carbon cycle

Answer is: A. water cycle.
Under influence of sunlight (energy), water evaporates (liquid phase transform into gas phase). Gas, after contact with bottle, turns into liquid phase again (condensation). That is happening with water in nature also (water moves from one reservoir to another).