Is rain falling a contact or noncontact force

When conducting an investigation to determine which type of fertilizer produces the most flowers on a plant, which variable would be graphed on the x-axis once you collected the data? a. type of fertilizer b. amount of flowers c. amount of water d. number of days that the plants grew

Does heating a metal wire increase or decrease its electrical resistance? why?

How do cracks affect the rate of weathering?