Climatic Optimum Warmest period during the Holocene epoch . During this time average global temperatures were 1 to 2 degrees Celsius warmer than they are today. May also involve the investigation of climate's effect on life and the abiotic environment. Climax Community Plant community that no longer undergoes changes in species composition due to succession . Closed System Is a system closed with respect to matter , but energy may be transferred between the system and its surroundings.
Earth is essentially a closed system.
Coal Sedimentary rock composed of the compacted, lithified and altered remains of plants. It is formed in several stages as the remains of plants are subjected to heat and pressure over millions of years. Coal Gasification Transformation of coal into synthetic natural gas . Coal Liquefaction Transformation of coal to a liquid hydrocarbon fuel such as synthetic gasoline or methanol. Coastal Wetland Wetland habitat found along a coastline and is covered with ocean salt water for all or part of the year.