An example of a grad-school level question?
Oil, coal, and natural gas are fossil fuels formed under what conditions?

An example of a grad-school level question?
A student reaches one hand into a bag filled with smooth objects. The student feels the objects but does not look into the bag. Which property of the objects can the student most likely identify?

An example of a grad-school level question?
Which of the following would be most useful for calculating the density of a rock sample?

An example of a grad-school level question?
When Isaac Newton theorized that gravity caused objects to fall to the ground, he had also discovered the force that causes