How do they get hydrogen out of the ground? ​

Ans: There are a number of ways to produce hydrogen: Natural Gas Reforming/Gasification: Synthesis gas, a mixture of hydrogen, carbon monoxide, and a small amount of carbon dioxide, is created by reacting natural gas with high-temperature steam. Electrolysis: An electric current splits water into hydrogen and oxygen.

I'm not 100 percent sure i say 7 is your answers