Ques: If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser. Will adds salt to the pot of water. The water's volume is now less dense or denser?
Ans: denser

Ques: A: As the car approaches the radar gun, the reflected microwaves get bunched up in front of the car. Therefore, the waves the receiver detects have a higher frequency than they would if they were being reflected from a stationary object. The faster the car is moving, the greater the increase in the frequency of the waves. When waves in the ocean go slow there will be less or more?
Ans: less

Ques: Richer nations use far more energy resources, especially fossil fuels, than poorer nations do. The US is richer than Uganda, so it likely uses more or fewer fossil fuels compared to Uganda?
Ans: more

Ques: More UV rays increase skin cancer rates. Eric went out into the sun from his room. The sun has fewer UV rays than the tanning light he was using in his room. His chance of skin cancer likely goes up or down?
Ans:
down