1001 Space Earth Nature History Human World Science and Technology Chemistry Materials Force and Energy Heat and Light Electricity and Magnetism Industry Machines Electronics and Computers Cars and Trucks Railways Ships Aircraft Fishing and Agriculture Undersea Exploration	Which is the most common element? The most common element on earth is oxygen. It makes up 47 percent of the rocks and 21 percent of the atmosphere. The water in the oceans is 89 percent oxygen. However, the most common element in the universe is hydrogen. The water in the oceans is 89 percent oxygen   Previous: Back Book: 1001 Section: Science and Technology Chapter: Chemistry