Leaking power steering fluid on 2000 Ford F-150

It apprears as though the power steering fluid is leaking from the gear box. What causes the leakage and from what part of the gear box? Its difficult to see exactly where its coming from.

Asked by for the 2000 Ford F-150
Could be one of the power steering hoses, the pump or the gear itself you have to wipe it down ( with the engine off ) and try and see exactly which component is bad. All the parts mentioned are available at your local autoparts store. Sometimes you can put in a power steering stop leak and it will seal the o rings.