December 9, 2024
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6 wild things we learned about Earth in 2024
It’s been a fascinating year in earth science: from mysterious ‘dark oxygen’ to an ‘unidentified seismic object’, here are the incredible things we learned about our planet in 2024.
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Modern humans have lived on Earth for over 300,000 years, but we’re still discovering tons about this massive breathing space we call home. From its deep 4.5 billion-year history to its present-day mysteries, here are six surprising things we learned about Earth in 2024.
Life-Giving Disasters
The new one begins with an event that occurred 3.26 billion years ago, when a massive asteroid—50 to 200 times larger than the one that wiped out the non-avian dinosaurs—crashed into the young earth. New research shows that this “S2 impact” destroyed the planet and its early simple life. But that too it caused the fundamental changes that would eventually allow the organism to thriveparticularly by sending crucial nutrients to the ocean. Despite the apocalyptic nature of the impact, therefore, the bacteria that managed to survive might eventually be better off than they were before the impact.
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The ancient seabed was found suspended beneath the Pacific Ocean
The Pacific Ocean is huge and hides some spectacular secrets. What we met this year is a 250 million year old sea floor slabshortly before the creation of the oldest known dinosaurs. The researchers found that the slab was trapped between 410 and 660 kilometers below the Earth’s surface. Ancient rock is slowly descending into a rare part of Earth’s outer core that protrudes into the planet’s rocky mantle.
“Dark Oxygen” from the bottom of the sea.
A favorite genre of scientific discovery is the one that begins with strange data, where the researchers think there is something wrong with their instruments. That’s what happened to a team studying seabed oxygen levels in a region of the Pacific called the Clarion-Clipperton Zone. “I literally told my students, ‘Throw the sensors in the bin. They don’t work,'” Andrew Sweetman, who studies seafloor ecology and biogeochemistry at the Scottish Society for Marine Science, said in an interview. American scientist. The sensors were fine, and they alerted the researchers to a strange process by which metallic deposits on the seabed mysteriously form.”dark oxygen“.
Before Dickson Fjord (August 2023) (left) and then (September 2023) (the right). Photos of the mountain peak and the glacier, taken from the fjord.
Søren Rysgaard (left); Danish army (the right) (CC BY-SA)
What caused this “Unidentified Seismic Object”?
In September 2023, earthquake sensors around the world emitted a strange, monotonous hum unlike any seismic signal ever detected, and it lasted for nine days. Scientists classified the source of the vortex as followsunidentified seismic object” and then went to work trying to identify it. Earlier this year it was determined that the signal was caused by a massive landslide in Greenland’s Dickson Fjord. The landslide caused a tsunami, followed by a seiche, or a wave that swept back and forth in the confined fjord for more than a week.
Earthquakes Forge Gold Nuggets
The large nuggets of gold found in the earth’s crust surprised geochemists, how dissolved gold seeped into the cracks of the quartz mineral could form small deposits, but not larger ones. New research, however, suggests just that earthquakes can do the job through a phenomenon known as the piezoelectric effect, through which certain materials can create an electrical charge under the influence of mechanical stress. Quartz is piezoelectric, so the scientists tested whether forces similar to seismic waves could create enough charge to start forming gold nanoparticles. Preliminary results suggest that this effect is sufficient.
Aleksandra Malysheva/Getty Images
Earth has won the Mini Moon
Earth’s moon is famous and rightly so: it’s scientifically informative, and amazing to boot. But despite what we learn in school, our planet may have several natural satellites at any given time. For two months this autumn, a little 10 meters wide The asteroid, known as 2024 PT5, became a “mini moon”. after our planet’s gravity enters a partial loop around Earth. And it turns out that Earth has a longer-term collection as well half a dozen “quasi-satellites” they don’t actually orbit the planet, but it looks like it. Friends!
