What does the term 'hydrosphere' refer to?

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The water-covered regions of the EarthThe layer of gases surrounding the planetThe atmospheric layer enveloping EarthThe solid outermost layer of the EarthNone of the above

Explanation

The hydrosphere encompasses all water found on, under, and over the surface of the Earth, including oceans, rivers, lakes, and groundwater. It is distinct from the atmosphere (air layers) and the lithosphere (Earth's crust).