Heat energy from the sun that causes liquid water to change to water vapor and the gravitational pull of the Earth that brings water to the surface are the two major forces that power  ____________. 

An ion is formed when an atom gains or loses a(n) _____________ and becomes a charged particle. 

VOCs are only caused by synthetic (man-made) organic chemicals. 

Which sector is the larger user of consumptive use water?

Photosynthesis and cellular respiration are two chemical reactions that are unrelated to one another and serve two different purposes in living organisms.  

Which subatomic particle is mostly involved in nuclear fission? 

Which of the following is a density-independent factor that contributes to the population growth rate of raccoons?

What are the top four gases that make up our atmosphere?

Which of the following is a consequence of ocean acidification?

You have pulled a slingshot back and are holding it in the stretched position, this is an example of …