Furthermore, the atmosphere responded to those processes that altered Earth's crust during the Archean and Early Proterozoic. These changes in turn altered climate and probably influenced the evolution of the biosphere. This chapter discusses evidence for both, the composition of the Archean atmosphere...
Earth, third planet from the Sun and the fifth largest planet in the solar system in terms of size and mass. Its single most outstanding feature is that its near-surface environments are the only places in the universe known to harbor life. Learn more ab
Earth's early and modern atmospheres comparedComparison of Earth's prebiotic and modern atmospheres. Before life began on the planet, Earth's atmosphere was largely made up of nitrogen and carbon dioxide gases. After photosynthesizing organisms multiplied on Earth's surface and in the oceans, much...
Mars' atmosphere is over 100 times thinner than Earth's and is primarily composed of carbon dioxide, nitrogen and argon gases.
The Composition of Meteors Meteors are tiny solid particles that enter Earth’s atmosphere from interplanetary space. Since the particles move at speeds of many kilometers per second, friction with the air vaporizes them at altitudes between 80 and 130 kilometers. The resulting flashes of ...
(driven by thermal or non-thermal processes or via large impacts) and enriched via delivery from smaller impacts1. The interplay of these central processes determines the atmospheric evolution and observable gas species in the atmosphere. Gaseous species released from present-day volcanoes on Earth ...
Sulfate is the dominating form of the sulfurous aerosol in the atmosphere.47,48 To further evaluate Fig. 3 we make the assumption that all the particulate sulfur is in the form of sulfate by assigning four oxygen atoms to each sulfur atom. The residual oxygen (Or) is assigned to the carbo...
"A large secular variation in the nitrogen isotopic composition of the atmosphere since the Archaean?": response to a comment on "The nitrogen record of cr... Nicolas,Dauphas,and,... - 《Earth & Planetary Science Letters》 被引量: 13发表: 2004年 Chemical composition and origin of the ...
Tectonic controls on greenhouse gas flux to the Paleogene atmosphere from the Gulf of Alaska accretionary prism The late Paleocene to early Eocene (ca. 61 56 Ma) was a period of long-term global warming, perhaps the warmest in the Cenozoic. Recent modeling suggests t... TL Hudson,LB Magoon...
This paper attempts to bring together and evaluate all significant evidence on the origin of meteorites. The iron meteorites seem to have formed at low pre