Answer: Interactions between hydrosphere and atmosphere.
Step-by-step explanation:
The following are the spheres of earth.
1. Atmosphere: It is a sphere which includes the mass of gases called as air.
2. Hydrosphere: It is a sphere which includes the total amount of water present on earth in the form of water bodies.
3. Biosphere: It is a sphere which includes the living beings.
4. Geosphere: It is a sphere which can be found below the surface of earth. It mainly includes the underground rocks and minerals.
According to the given situation, the jar completely filled with water represents the hydrosphere. It is mentioned that it was kept in sunlight. The heat of sunlight will cause the water to evaporate. The water vapors will become the part of the atmosphere.