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 ...

Consequently, oxygen levels began to rise in the atmosphere while carbon dioxide levels dropped. What is the chemical composition of the Earth's atmosphere? It is composed of about 21 percent of it. A ...

The team found that, in the Barberton quartz, 3.3 billion year old U-Xe has a composition very different from the xenon found in the Earth’s atmosphere today. Lead author Dr Guillaume Avice from CRPG, ...

Researchers have made a new discovery that changes our understanding of Earth's early geological history, challenging beliefs about how our continents formed and when plate tectonics began.

While trying to determine if it could use the entire Earth's atmosphere as a massive sensor, the US military’s Defense Advanced Research Projects Agency (DARPA) made a highly unusual detection.