What is the hydrosphere? What are its constituent parts can be seen on the physical map?

The hydrosphere, like the atmosphere, is always in motion. The movement of rivers and streams can be easily seen, while the movement of water in lakes and ponds is less obvious. Some movement of the oceans and seas can be easily seen, while larger movements that move water over long distances, such as between the tropics and the poles or between continents, are difficult to see. These currents exist on the surface of the ocean and at great depths in the ocean.

On the physical map you can see rivers, oceans, seas, lakes.