Carbon is the 15th most abundant element in the Earth's crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. Carbon's abundance, its unique diversity of organic compounds, and its unusual ability to form polymers at the temperatures commonly ...
The half-life of carbon-14 has been determined with an accuracy believed to be higher than that of previously reported values. Carbon dioxide was liberated by the action of perchloric acid on barium carbonate which contained C14 in approximately 44 percent isotopic abundance. Samples of this C14 ...
It is found in abundance in the sun, stars, comets, and atmospheres of most planets. Carbon in the form of microscopic diamonds is found in some meteorites. Natural diamonds are found in kimberlite or lamporite of ancient formations called “pipes,” such as found in South Africa, Arkansas,...
Mg ha− 1) or as a percent (with or without bulk density data) for each depth increment, making it difficult to compare findings and synthesize data across studies (Bansal et al. 2023a). The objective of this meta-analysis was to assess how wetland soil organic carbon stocks differ ...
Abrupt permafrost thaw, known as thermokarst, occurred in about 20 percent of the northern permafrost region on Earth that stores about half of all below-ground organic carbon. The researchers from the Institute of Botany under the Chinese Academy of Sciences found that the warming-induced increase...
Azeem M, Hayat R, Hussain Q, Ahmed M, Imran M, Crowley DE (2016) Effect of biochar amendment on soil microbial biomass, abundance and enzyme activity in the mash bean field. J Biodivers Environ Sci 8(6):1–13 Google Scholar Azeem M, Hayat R, Hussain Q, Tahir MI, Imran M, Abbas...
Table 3 Number of estuaries, estuarine surface area, and percent of total estuary surface area classified by estuary type according to Dürr et al.2and classified by disturbance in NLWRA40for sampled estuaries in this study and in all Australia ...
A wooden artifact from an archeological dig contains 32 percent of the carbon-14 that is present in living trees. To the nearest year, about how many years old is the artifact? (The half-life of carbon-14 is 5730 years.)...
However, it suffers severely from the low natural abundance of covalently bound 13C–13C pairs. Several groups have recently offered modifications of the pulse sequence to try to overcome this limitation. It remains to be seen, however, if these new programmes will produce the higher ...
Carbon (from Latin: carbo "coal") is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon makes up only about 0.025 percent of Earth...