An example of a grad-school level question?
The rocks that form most of the Sierra Nevada are granitic rocks. This means that the mountains were most likely formed by

An example of a grad-school level question?
The Himalayan Mountain chain is the youngest and tallest mountain chain on Earth. Which phenomenon contributed most to this area of continental buildup?

An example of a grad-school level question?
If you wanted to be able to look at the stars, the planets, and the Moon more closely, what should you use?

An example of a grad-school level question?
Which of the following best describes a role of mushrooms in ecosystems?