Question

What is the hydrosphere?

Answer 1

all the waters on the earths surface, including lakes, seas, oceans, ponds, and even water over the earth's surface, such as clouds, occasionally.

Answer 2

The hydrosphere is all the water on Earth.

This includes lakes, rivers, and all the gas clouds because

water can be solid, liquid, or gas so oceans, ice caps, water vapor, etc..