from winds :)
Suface currents form from the wind. The wind can make the surface cold or warm.
The moon
Volcanic.
A difference between gyres and currents is that currents are formed by the wind, but gyres are formed by currents.
Volcanic Mountains
Not sure what a suface cuurrent is. In deep water, there often are currents that flow in different directions at different depths. A surface current will flow in one direction, near the surface, while there will be a current flowing in the opposite direction deeper down.
It is an active volcano.
the ocean .
normal
Silver sulfide is formed on the suface of silver objects.
winds
Cumulonimbus clouds are formed by strong convection currents. These clouds are tall and dense, often associated with thunderstorms and heavy rainfall.