As air temperatures increase, more water evaporates. water is a greenhouse gas, so more water in the atmosphere leads to greater global warming. is this positive feedback loop, negative feedback loop, neither, or no answer provided?

Ascientist observes hot water erupting from a vent in the earth. what most likely caused the water to rise and erupt from the vent? the vent was lower than the water table. a well was drilled into a pressurized aquifer. a well with a mechanical pump was installed. the water was heated by magma or hot rocks.