Everyday Science The earth revolves around the sun at a speed of__________? Options:A. 18.5 km/secB. 26.6 km/secC. 29 km/secD. 31.9 km/secView AnswerC. 29 km/sec Continue Reading Previous: _________ means a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.Next: What is the percentage of salt water on earth surface?