An example of a grad-school level question?
A windstorm knocks down many trees in a national park. Timber companies want to get rid of the fallen trees. How would this most likely harm the park ecosystem?

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?
Traits are transferred from generation to generation through the

An example of a grad-school level question?
A hurricane is a heat engine which converts one kind of energy into another. Hurricanes convert most of the heat energy into