Bases have pH values above 7. The higher the pH value, the more strongly basic the substance. Having read the above passage, choose the right answer to the following question (choices are increase or decrease ): If Mona is filling her pool with chemicals to change the pH level of the water and she decreases the pH, what happens to the baseness of the water increase or decrease?
decrease

For a given medium, sound waves travel more slowly at lower temperatures. Having read the above passage, choose the right answer to the following question (choices are faster or slower ): Eric moved to Arizona from Alaska. The higher temperatures overall mean that sound travels faster or slower?
faster

Q: If there are more greenhouse gases in the atmosphere, more ultraviolet radiation will be trapped and the Earth will heat up. Having read the above passage, choose the right answer to the following question (choices are Tony or Evan ): Tony drives an SUV that contributes many greenhouse gases to the atmosphere. Evan rides a scooter that contributes few greenhouses gases to the atmosphere. Who likely contributes less to the Earth heating up Tony or Evan?
A: Evan

Question: Water density increases as salinity and pressure increase, or as temperature decreases. Having read the above passage, choose the right answer to the following question (choices are regular water or salt water ): If you mixed salt water and regular water which would sink regular water or salt water?
Answer: salt water

*Question*
For a given medium such as air, sound has a slower speed at lower temperatures. Having read the above passage, choose the right answer to the following question (choices are increase or decrease ): If Mary is blowing an air horn underwater and she lowers the temperature of the water, what will happen to the speed of the sound waves generated by the air horn increase or decrease?
**Answer**
decrease

(Q).
In the mesosphere, temperature decreases as altitude increases. Having read the above passage, choose the right answer to the following question (choices are increase or decrease ): If a person sank lower within the mesosphere, would the temperature increase or decrease?
(A).
increase