Natural gas hydrates

Natural gas hydrates
  Solid, crystalline, wax-like substances composed of water, methane, and usually a small amount of other gases, with the gases being trapped in the interstices of a water-ice lattice. They form beneath permafrost and on the ocean floor under conditions of moderately high pressure and at temperatures near the freezing point of water.
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary

Energy terms . 2014.

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