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The helium then moves upward through porous sedimentary cover until it is trapped with natural gas under beds of anhydrite or salt. The liberated helium is buoyant and moves toward the surface in porosity associated with basement faults. Helium is produced by the decay of uranium and thorium in granitoid basement rocks.

Helium-bearing natural gas deposits: Deposit model for helium-bearing natural gas fields in the United States.

Other important uses of helium include: a protective gas for welding, an inert gas for controlled atmosphere manufacturing, a fugitive gas used for leak detection, and a low-viscosity gas for pressurized breathing mixtures. In its most important use, liquid helium (a super-cold liquid at -269 degrees Celsius or -452 degrees Fahrenheit) is used to cool MRI (magnetic resonance imaging) machines used in medical facilities. Most people know that helium is used as a lifting gas in blimps and party balloons, but they can't name another way in which helium is used. It has the smallest atomic radius of any element and the second-lowest atomic weight. Helium is a chemical element and a colorless, odorless, tasteless, inert gas. The use that consumes more helium than any other is cooling the magnets in MRI (magnetic resonance imaging) machines in medical facilities. Helium Blimp: Most people have heard of helium being used as a lifting gas for weather balloons, blimps, and party balloons.