An example of a grad-school level question?
Which is the best example of recycling?

An example of a grad-school level question?
Which rapid changes are caused by heat from inside Earth?

An example of a grad-school level question?
When a cold front moves over a land region that has warm, moist air, a transfer of energy occurs. Cold air sinks and pushes warmer air upward. As energy is removed from the air, which change will most likely take place?

An example of a grad-school level question?
What happens when water flows over a rock for a long period of time?