Ques: Greater use of oil and other fossil fuels causes more pollution.  If the citizens of Europe stopped using oil, they should have more or less pollution?
Ans: less

Ques: As humidity increases, the water potential gradient across the inside and outside the leaf become more equal, and so the rate of transpiration decreases.  Joe noticed that the humidity inside the greenhouse was getting very high, so he opened the roof to let cooler air inside. Thus, when the water potential gradient across the inside and outside of the leaf becomes equal, the rate of transpiration will increase or decrease.?
Ans: decrease.

Ques: As the amount of water increases, the melting point of rock decreases.  Ian is trying to melt rocks, nothing that the water around the rocks is quite low. Since there is not a lot of water around the rocks, the melting point of the rock will be increased or decreased?
Ans: increased

Ques: Objects with greater mass have a stronger force of gravity.  If Milo adds mass to an object, what will happen to the force of gravity that object generates decreases or increases?
Ans:
increases