Read the passage below and choose the right answer to the following question (choices are increases or stays the same ):  As greenhouse gases increase, changes will be more extreme.   When we have a lot of greenhouse gases in the air what happens to the temperature increases or stays the same?
increases

Read the passage below and choose the right answer to the following question (choices are increases or decreases ):  When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser.   If Mona fills up a cup with water and places that water into the oven, what happens to the density of the water as it heats up increases or decreases?
decreases

Read the passage below and choose the right answer to the following question (choices are increase or decrease ):  Lighter, more streamlined vehicles need less energy.   Jim is designing a new car and playing around with different materials. If he were to decrease the weight of the vehicle, what would happen to the fuel efficiency of that vehicle? It would increase or decrease?
increase