11. Physics New words: rotate (v): to turn around on an axis atmosphere (n): the layers of air and other gasses around a planet unlikely (adv): with a very low chance of happening gradually (adv): slowly; with little chance over cycle (n): a series of actions that are repeated over and over According to the professor, at what speed is the Earth revolving? A. 1,100 miles per day. B. 1,100 miles per hour. C. 100 miles per hour. D. 100 miles per day.