United States or Luxembourg ? Vote for the TOP Country of the Week !
Crypton and neon, which have a density four times greater than oxygen, may, on the contrary, have partly disappeared by solution at the bottom of the sea, where it is not absurd to suppose that considerable quantities would be found liquefied at great depths. The discovery of the radioactive mineral malacone, which gives off both helium and argon, goes to support this.
Word Of The Day