Explanation
The correct answer is (A) Combined mass of water found on, under, and over the surface of a planet.
The hydrosphere refers to all the water on, beneath, and above the Earth's surface. It includes oceans, seas, lakes, rivers, groundwater, glaciers, and even atmospheric water vapor. The hydrosphere plays a crucial role in various Earth processes, including the water cycle, climate regulation, and supporting life. Options (B) and (C) do not accurately describe the hydrosphere. Option (B) refers to the biosphere, which encompasses all living organisms, and option (C) does not specifically relate to the hydrosphere.
