The Oceans
They are mostly hidden underwater because nothing has yet made them erupt and come to the surface.
Most.
NO. not at all. most are in the pacific, surrounding the Ring Of Fire
most volcanoes are formed from a hot spot in the earths crust.
The Ring of Fire
under the sea! All over the world of course.
Asia,Africa,Antartica,South America and Europe
In the "Ring of Fire" on the Pacific Rim (a.k.a. Pacific Ocean)
there is volcanoes in the rainforests there are hidden on the ground
However, volcanoes are essential to earths survival they act like a safety valve for the planet (it releases pressure)
Volcanoes aren't exactly hidden, but over the years, the sea level gets higher & higher, & some volcanoes go underwater, were we cannot see them at all.
Volcanoes are essentially holes in the earths surface through which magma and lava can erupt. when pressure builds up below the earths crust, magma is then forced violently out of the volcanoes.