And in fact, before plants appeared on Earth, scientists think there was much more carbon dioxide but no oxygen in the early atmosphere. The composition of the atmosphere has changed over time ...

Why Earth's atmosphere extends farther than previously ... the sky in ultraviolet wavelengths to study the chemical composition of stars and galaxies would need to take this into account," Jean ...

Earth is the only known planet which has plate tectonics today. The constant movement of these giant slabs of rock over the ...

Their extent of oxidation provides insights into the composition of the atmosphere at the time when they fell to Earth. In this case ~87 Million years ago. We are pioneering a new field of study that ...

Get Instant Summarized Text (Gist) Earth's first crust, formed around 4.5 billion years ago, likely had chemical features similar to today's continental crust, suggesting that the distinctive ...

The atmospheric formation of secondary pollutants such as ozone and aerosol and their influence on air quality and climate. Development and use of mass spectrometric and other methods for measurements ...