Because the amount of hydrogens all depends on the valence electrons
3Fe(s) + 4H2O(l) — 1Fe3O4(s) + 4H2(g)
The global wind patterns cause the surface currents to form in the uppers layer of the ocean.
I don't understand the question
As the temperature is increased all the molecules including the gas molecules get more kinetic energy, they move faster, and more of them can escape from the solution when they hit the surface meaning fewer molecules stay inside, hence lower solubility.
