OK: finally, on this rainy April morning, here is a worksheet on the Greek word root sphere. It means ball. I’ll assume I needn’t belabor the point that students should know this root, which is also, per se, a noun in the English language as well as combining to make a variety of nouns in the sciences and mathematics.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.