Q: Warm air is less dense than cool air, so it rises higher in the troposphere.  Fred started a fire on the beach. The air distant from the fire likely falls or rises?
A: falls


Q: Water flowing over a steeper slope moves faster and causes more erosion.  Mona is a scientist studying erosion at a university. She is observing a river. If she starts taking erosion measurements at the mouth of the river and moves up to the head of the river, what will she find happens as the slope gets steeper erosion decreases or erosion increases?
A: erosion increases


Q: However, the energy is diluted as an electromagnetic wave travels farther from its source because it spreads out over an ever-larger area.  An electromagnetic wave is traveling. Ned notices that the wave has stayed at its origin. As it travels, it is more diluted or less diluted.?
A: less diluted.


Q: By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.  What happens when you make a rocket heavier goes higher or falls down?
A: falls down