How do volcanoes affect the hydrosphere?

Question

How do volcanoes affect the hydrosphere?

Answer 1

magma and lava contain water.

When a volcano erupts it releases some of that water into the atmosphere and adds to the hydrosphere.

In addition, big volcanos affect climate (usually raise the earth's albedo leading to cooling of the atmosphere), and can therefore affect the hydrosphere because it is temperature dependent (i.e. temperature defines whether water is liquid, solid or gas)

Answer 2

Hot springs are created when groundwater is heated by the surrounding rocks,particularly in volcanic areas such as Iceland,Rotorua in New Zealand and Yellowstone park.Geysers are fountains of boiling water that erupt.Steams and gas emerge sometimes through the vents of the volcanoes and these vents are called'fumeroles'.Thus water, in the form of gas(steam) or hot water are ejected out by the volcanoes affecting the hydrosphere,though on a small scale.