What are examples of hydrosphere?

Its translation from its Latin roots, means ' a ball of water'.

Hydros = Water

Sphere = a ball.

However, where the Earth is considered , the hydrosphere is all the water of the seas and oceans.

Think in parallel as atmosphere [ a ball of air around the Earth.

or

BiOSphere; the sphere were all living matter exists.

Then there's the lithosphere, and the Ionosphere.

The Earth as a planetary object maybe though of a spheres , overlapping each other. A bit like an onion(vegetable).