About 2.4 billion years ago there was a dramatic increase in the level of free oxygen in the Earth’s atmosphere, which led to the widespread extinction of many species of bacteria which had evolved when the atmosphere was anaerobic. Previously … Continue reading
The Earth’s magnetic field permanently protects us from the charged particles and radiation that originate in the Sun. This shield is produced by the geodynamo, the rapid motion of huge quantities of liquid iron alloy in the Earth’s outer core. … Continue reading
Professor of geoscience, John Valley of the University of Wisconsin, and others, have used atom-probe tomography for the first time to determine the age of a zircon crystal from the Jack Hills region of Western Australia, dating it to 4.4 … Continue reading
Another History of the Earth book is due out tomorrow. Dr. Robert M. Hazen, a research scientist at the Carnegie Institution of Washington’s Geophysical Laboratory and Clarence Robinson Professor of Earth Science at George Mason University, is the author of … Continue reading
The oldest rocks on Earth could have formed as early as 120 million years after the solar system was formed rather than approximately 200 million years after, as was previously thought, following a new measurement of the half-life of Samarium-146. … Continue reading
Earth Formation : How the Earth is a the byproduct of a local supernova via Earth Formation | Cosmology and Astronomy | Khan Academy. The Khan Academy is a not-for-profit with the goal of changing education for the better by … Continue reading