By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. At standardized conditions for temperature and pressure, two atoms of the element bind to form dioxygen, a diatomic gas that is colorless, odorless, and tasteless, with the formula O 2.xygen constitutes 49.2% of the Earth's crust by mass and is the major component of the world's oceans (88.8% by mass). Oxygen gas is the second most common component of the Earth's atmosphere, taking up 20.8% of its volume and 23.1% of its mass (some 10 15 tonnes).
Riviera, Mediterranean coastland between Cannes (France) and La Spezia (Italy). The French section comprises part of the CÃ´te dâAzur (which extends farther west), while the Italian section is known to the west and east of Genoa as the Riviera di Ponente and the Riviera di Levante, respectively.
RIVIERA MAYA, TULUM & CANCUN: OFFERING WHITE SANDS, MAYAN TEMPLES, FUN NIGHTLIFE & BEAUTIFUL REEFS. When travelers think of Mexicoâs beautiful crystalline waters and white sand beaches, they are thinking of this Caribbean coastline and luxury in the Riviera Maya.