Why do water and hydrogen peroxide have different properties

The formula for water is H20. The formula for hydrogen peroxide is H202. Hydrogen Peroxide has two oxygen molecules, where as water only has one.

Its because they are two different molecules

That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.

And a) oxygen i believe