Sulphur from the volcanic vents give Rotorua it's distinctive smell, even more so at Sulphur Point. So, what can we learn about Sulphur (also spelled sulfur in US English): a chemical element, has symbol S, atomic number 16, abundant, multivalent and nonmetallic, elemental sulfur is bright yellow, 10th most abundant element by mass in the universe, 5th most common on Earth, mentioned for its uses in ancient India, ancient Greece, China, and ancient Egypt, historically and in literature sulfur is also called brimstone, which means "burning stone". greatest commercial use is the production of sulfuric acid for sulfate and phosphate fertilisers, an essential element for all life, 8th most abundant element in the human body by weight, a 70 kg (150 lb) human body contains about 140 grams (4.9 oz) of sulfur, when burned in air, it produces sulfur dioxide gas, in water, this gas produces sulfurous acid. Every day is a school day.