An example of a grad-school level question?
What most likely happens to soil when crops are not rotated from year to year?

An example of a grad-school level question?
What season is the Northern Hemisphere experiencing when it is tilted directly toward the Sun?

An example of a grad-school level question?
Which of these provides the best evidence that the distribution of Earth's oceans has changed over time?

An example of a grad-school level question?
The following represents a number displayed on a calculator. 1.454545 E3. Which of the following shows how a student should record this number in a laboratory report?