Scientists examined rock cores taken from the Chicxulub crater in Mexico, site of the asteroid impact that triggered dinosaur extinction, and found iridium, a telltale sign of asteroids. Source: https://earthsky.org/earth/asteroid-dust-iridium-chicxulub-crater-dinosaur-extinction…
Tag: sediment
What’s the coldest Earth has ever been?
Our planet’s history includes episodes of cold so extreme that glaciers reached sea level in equatorial regions. Source: https://earthsky.org/earth/whats-coldest-earth-has-ever-been…
A giant undersea sand worm’s fossilized lair
In 20-million-=year-old rock off the coast of Taiwan, researchers have discovered what they think is the fossilized burrow of a giant, predatory sand worm. Source: https://earthsky.org/earth/scientists-find-evidence-of-giant-predatory-sand-worms…
Ancient Mayan civilization used advanced water treatment technology
The oldest known example of a water treatment system in the Western Hemisphere was recently discovered in Guatemala. Source: https://earthsky.org/human-world/ancient-mayan-civilization-used-advanced-water-treatment-technology…
Scientists and Philosopher Team Up, Propose a New Way To Categorize Minerals
An anonymous reader shares a report: Some diamonds were formed billions of years ago in space as the carbon-rich atmospheres of dying stars expanded and cooled. In our own planet’s lifetime, high-temperatures and pressures in the mantle produced the diamonds that are familiar to us as gems. 5,000 years ago, a large meteorite that struck a carbon-rich sediment on Earth produced…
Scientists discover ancient lake bed deep beneath Greenland ice
The ancient lake bed, sealed more than a mile under Greenland ice, may be hundreds of thousands or millions of years old, and contain unique fossil and chemical traces of past climates and life. Source: https://earthsky.org/earth/ancient-lake-bed-deep-beneath-greenland-ice…
Boom! Bam! Boom! How to make a triple crater on Mars
Like many worlds in our solar system, Mars has prominent impact craters. A particularly unusual example is shown in this new image from ESA’s Mars Express: an ancient triplet composed of 3 overlapping craters. Source: https://earthsky.org/space/mars-express-ancient-triple-impact-crater…
The Arctic hasn’t been this warm for 3 million years
The last time CO2 concentrations reached today’s level was 3 million years ago, during the Pliocene Epoch. Hear from geoscientists who see evolving conditions in the Arctic as an indicator of how climate change could transform the planet. Source: https://earthsky.org/earth/arctic-warmest-3-million-years…
More Than 14m Tonnes of Plastic Believed To Be at the Bottom of the Ocean
At least 14m tonnes of plastic pieces less than 5mm wide are likely sitting at the bottom of the world’s oceans, according to an estimate based on new research. From a report: Analysis of ocean sediments from as deep as 3km suggests there could be more than 30 times as much plastic at the bottom of the world’s ocean than there…
Liquid Water on Mars? New Research Indicates Buried ‘Lakes’
The existence of liquid water on Mars — one of the more hotly debated matters about our cold, red neighbor — is looking increasingly likely. From a report: New research published Monday in the journal Nature Astronomy indicates there really is a buried reservoir of super-salty water near the south pole of the planet. Scientists say such a lake would significantly…