Earth compositionEarth mantleEarth structuregeochemistryoceanographyterrestrial atmosphereterrestrial heat/ Earth early evolutionEarth accretionoceans massAtmospheric and thermal evolution of the earth growing by planetesimal impacts was modeled by taking into account the blanketing effect of an impact-induced H2O...
Ideas about atmospheric composition and climate on the early Earth have evolved considerably over the last 30 years, but many uncertainties still remain. It is generally agreed that the atmosphere contained little or no free oxygen initially and that oxygen concentrations increased markedly near 2.0 bi...
Earth's early atmosphere Ideas about atmospheric composition and climate on the early Earth have evolved considerably over the last 30 years, but many uncertainties still remain. I... J.F. Kasting - 《Science》 被引量: 1438发表: 1993年 Earth's early atmosphere. (cover story) Examines the ...
The history of the Earth has been marked by major ecological transitions, driven by metabolic innovation, that radically reshaped the composition of the oceans and atmosphere. The nature and magnitude of the earliest transitions, hundreds of million years before photosynthesis evolved, remain poorly un...
Magmatic outgassing of volatiles from Earth's interior probably played a critical part in determining the composition of the earliest atmosphere, more than 4,000 million years (Myr) ago. Given an elemental inventory of hydrogen, carbon, nitrogen, oxygen and sulphur, the identity of molecular ...
What were atmospheric CO_2 concentrations like during the Pro-terozoic eon, the interval of Earth's history between about 2,500 million and 543 million years ago? The issue is germane to studies of the ancient biosphere because, owing to the way in which the Sun's composition and other ...
early Earth should have been covered by ice, not water. Somehow, Earth's early atmosphere must have retained heat more effectively than the modern atmosphere. In deed, reconstructions of the early atmosphere's composition suggest high levels of CO2, water vapor, and methane, which would have ca...
Somehow, Earth's early atmosphere must have retained heat more effectively than the modern atmosphere. In deed, reconstructions of the early atmosphere's composition suggest high levels of O2, water vapor, and methane, which would have caused efficient heat retention. 1.Earth formed just under ...
This means that at the beginning of the magma-ocean, solidification took place at a temperature of ~1,273 K within the early Earth's atmosphere at a pressure of ~35 MPa (see Fig. 2.16). The sulfur-layer would have been composed almost entirely of SO2 and would have had a density of...
atmosphere was reducing20. However, the degree to which the atmosphere was reducing is still uncertain and the exact composition of the reducing mixture remains unknown. Based on astrochemical studies and analysis of interplanetary matter, we can expect delivery to the early Earth of simple ...