Which describes the greenhouse effect?
an artificial process
a dangerous process
a natural process
a new process

A natural process is correct.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

i think that d. wind is the answer.   i missed the question when i answered a. currents.