Purines and pyrimidines are nitrogen bases found in DNA and RNA .They are nitrogen containing heterocyclic compounds .Purines are large double ringed while pyrimidines are sma â¦ ll single ringed .
Frozen Methane is exactly what it sounds like. Frozen methane. Or in other words, it's methane locked in ice, which is called hydrates. It is also known as fire ice, because of it's ice-like appearance and ability to burn when lit with a match. Frozen Methane is formed when a large amount of methane is trapped within a crystal structure of water, forming a solid similar to ice.
Methane Hydrate Stability Curve. In this example, the zone in which gas hydrate can exist is between 1200 and 1500 meters. (Actually, methane hydrates can exist anywhere from about 300 to 200 meters, depending on temperature conditions and sediment depth.) To explain the various lines: The phase boundary line (a pressure/temperature line) divides the methane as hydrate (that is methane ice) to the left of the line from methane that has dissociated from hydrate on the right.