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Organic compounds, such as methane, that contain only hydrogen and carbon.
Marine carbon cycle
That part of the carbon cycle that involves the circulation of carbon in seawater through biological activity and inorganic processes.
CH4; a gaseous hydrocarbon that is the main component of natural gas.
The force that gives a mass of one kilogram (kg) an acceleration of one metre per second per second (m s−2), and is therefore equivalent to 1 kg m s−2.
Energy resources that are replenished naturally over extended timescales of thousands or millions of years. As they are exploited faster than they are replenished they are considered as non-renewable.