An example of a grad-school level question?
About how much of Earth's surface is covered by oceans?

An example of a grad-school level question?
Jonathan places a pot of water on a stove. As the water boils, how does the state of the water change?

An example of a grad-school level question?
From Earth, the Sun appears brighter than any other star because the Sun is the

An example of a grad-school level question?
A rock has most likely traveled a long distance from its place of origin if it is