More pollutants mean poorer air quality. When a river gets full of a lot of waste chemicals it becomes cleaner or dirtier?
dirtier

On a hot day, an endotherm may give off more heat by increasing blood flow to the surface of the body. Karen is feeling very warm, and starts to sweat. Her blood flow is increased, likely because the day is hot or cold?
hot

Q: Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do. Chris is studying two countries. He finds that China has half as many factories putting out fossil fuels into the air than the United States. Based on this information, the factories in United States or China are causing more air pollution?
A: United States

Question: The more basic a solution is, the closer its pH value will be to 14. A solution with a pH value of 14 is definitely or not considered to be basic?
Answer: definitely

*Question*
In erosion, a slower moving stream will only carry smaller particles. A fast stream is capable of moving boulders or sand?
**Answer**
boulders

(Question)
The closer to the surface an aquifer is, the easier it is to get the water. If Milo is hunting for water and he finds two water sources, which one will it be easier for him to extract water from one close to the surface or one far from the surface?
(Answer)
one close to the surface