TASK DEFINITION: In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
PROBLEM: Question: An object with a rough surface will have _____ friction than an object with a smooth surface. 
 Answer: more

SOLUTION: Friction is greater when objects have rougher surfaces or are heavier so they press together with greater force.

PROBLEM: Question: Carbon dioxide levels increasing cause the temperature to 
 Answer: increase

SOLUTION: An increase in greenhouse gases leads to greater greenhouse effect.

PROBLEM: Question: Will adds salt to the pot of water. The water's volume is now 
 Answer: denser

SOLUTION:
If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser.