Tag Archives: tipped

Earth Tipped on Its Side 84 Million Years Ago, New Evidence Suggests

We know that true polar wander (TPW) can occasionally tilt whole planets and moons relative to their axes, but it’s not entirely clear just how often this has happened to Earth.

 

Now a new study presents evidence of one such tilting event that occurred around 84 million years ago – when dinosaurs still walked the Earth.

Researchers analyzed limestone samples from Italy, dating back to the Late Cretaceous period (100.5 to 65.5 million years ago), looking for evidence of shifts in the magnetic record that would point towards an occurrence of TPW.

Bacteria fossils trapped in the rock, forming chains of the mineral magnetite, offer some of the most convincing evidence yet of true polar wander in the Late Cretaceous – and it may help settle a scientific debate that’s been going on for decades.

How true polar wander looks. (Victor C. Tsai/Wikimedia Commons/Public Domain)

“This observation represents the most recent large-scale TPW documented and challenges the notion that the spin axis has been largely stable over the past 100 million years,” the researchers explain in their paper.

Earth is made up of a solid metal inner core and a liquid metal outer core, with a solid mantle and crust (the surface) moving slowly around on top of the liquid metal. Earth’s magnetic field, generated by the outer core, is recorded in rocks like the ones studied here.

 

True polar wander is when the geographic poles shift substantially, so the outer wrapping of Earth tilts over. Nothing actually changes in terms of Earth’s magnetic field, but the shifting rocks will record different paleomagnetic data as they move.

That data reveals the distance to the North and South geographic poles, enabling researchers to plot where these poles actually are. A fully vertical field means a rock was at the pole, while a fully horizontal field indicates it was at the equator.

“Imagine looking at Earth from space,” says geologist Joe Kirschvink, from the Tokyo Institute of Technology in Japan. “True polar wander would look like the Earth tipping on its side, and what’s actually happening is that the whole rocky shell of the planet – the solid mantle and crust – is rotating around the liquid outer core.”

Part of the extraction work. (Ross Mitchell)

According to the study, there was around a 12 degree tilt on Earth around 84 million years ago, which was corrected relatively quickly – within about 5 million years, the equivalent of a “cosmic yo-yo” in the words of the researchers.

What that means is that these rocks – and Italy itself – took a journey towards the equator before tipping back. Another recent study suggests that a similar tilt is underway at the moment, driven by the climate change affecting the planet.

The team says that previous studies hinting that true polar wander didn’t happen during the Late Cretaceous simply didn’t gather enough data from the geological record – something that can’t be said about the latest research.

“That is one reason why it is so refreshing to see this study with its abundant and beautiful paleomagnetic data,” says geophysicist Richard Gordon, from Rice University in Houston, who wasn’t involved in the study.

The research has been published in Nature Communications.

 

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Oil nations tipped for political instability if fossil fuels abandoned

The Egina floating production storage and offloading vessel, the largest of its kind in Nigeria, is berthed in Lagos harbor on February 23, 2017.

Stefan Heunis | AFP | Getty Images

LONDON — Algeria, Chad, Iraq and Nigeria will be among the first countries to experience political instability as oil producers feel the effects of a transition to low carbon energy production, according to a new report from risk consultancy Verisk Maplecroft.

In its 2021 Political Risk Outlook, published Thursday, Verisk cautioned that countries that had failed to diversify their economies away from fossil fuel exports faced a “slow-motion wave of political instability.”

With the move away from fossil fuels set to accelerate over the next three to 20 years, and the Covid-19 pandemic eating into short-term gains gains in oil export revenues made in recent years, Verisk warned that oil-dependent countries failing to adapt risk sharp changes in credit risk, policy and regulation.

Though some countries are increasing fossil fuel investment in the short term, consensus estimates indicate that “peak oil” will be reached in 2030, after which the transition toward a low carbon economy will gather steam and force oil-producing countries to adapt their revenue streams.

Analysts suggested the worst-hit countries could enter “doom loops of shrinking hydrocarbon revenues, political turmoil, and failed attempts to revive flatlining non-oil sectors.”

Since the oil price crash of 2014, most exporters have either stagnated or reversed efforts to diversify their economies, Verisk data highlighted, with many doubling down on production in the ensuing years in a bid to plug revenue holes.

“Despite this, the majority took a hit on their foreign exchange reserves anyway, including Saudi Arabia, which has burnt through almost half of its 2014 dollar stockpile,” the report added.

Break-even costs, the capacity to diversify and political resilience were identified as the three key factors determining the severity of the impact on stability when the expected energy transition begins to bite.

“Currently, if countries’ external break-evens – the oil prices they need to pay for their imports – remain above what markets can offer, they have limited choices: draw down foreign exchange reserves like Saudi Arabia since 2014, or devalue their currency like Nigeria or Iraq in 2020, effectively rebalancing their imports and exports at the expense of living standards,” the report explained.

Nigeria, Africa’s largest economy, relies on crude sales for around 90% of its foreign exchange earnings and has devalued its naira currency twice since March last year. The IMF last month urged the country’s central bank to devalue once again, but met with resistance.

Verisk researchers suggested that recent currency devaluations were a “harbinger of the bleak options” ahead for oil-producing countries, who will have to either diversify or face forced economic adjustments.

“Many, if not a majority, of net oil producers are going to struggle with diversification largely because they lack the economic and legal institutions, infrastructure and human capital needed,” said Verisk Head of Market Risk James Lockhart Smith.

“Even when such institutions are in place, the political environment, corruption or governance challenges and entrenched interests mean some may not reform their way out of trouble, even where it is the rational course.”

The most vulnerable countries are higher-cost producers that are heavily dependent on oil for revenues, have lower capacity to diversify and are less politically stable, Verisk said, identifying Nigeria, Algeria, Chad and Iraq as the first to be hit “if the storm breaks” due to their fixed or crawling exchange rates.

Lower-cost Gulf producers with stronger economic institutions and resources that enable easier diversification, such as the UAE and Qatar, were seen as least susceptible to political upheaval. However, Lockhart Smith suggested that even they will not emerge unscathed.

“Authoritarian political stability is anything but stable over the long term and, as lower-for-longer oil prices cut into social spending, additional pressure will pile on these deceptively fragile political systems,” he said.

“Even diversification could come with its own political risks by challenging traditional petro-state social contracts: legitimacy to rule in return for hydrocarbon largesse.”

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Samsung’s next Galaxy Watch tipped to get diabetes monitoring skills

  • According to a new report, Samsung will include an optical sensor for diabetes monitoring on its next Galaxy Watch.
  • The feature could appear on the Galaxy Watch 4 or the Galaxy Watch Active 3.
  • It’s tipped to debut in the second half of this year.

The first rumor about the next Galaxy Watch is here. According to Korea’s ETNews, Samsung could add a blood glucose monitoring feature to the tentatively named Galaxy Watch 4 or Galaxy Watch Active 3.

The new ability could make it much easier for people with diabetes to track their daily blood sugar levels. The tech reportedly uses an optical sensor to determine the readings, eliminating the need for drawing blood. It’s similar to how a number of smartwatches, including the Galaxy Watch 3, provide blood oxygen or SpO2 readings.

Samsung has been working on non-invasive techniques for blood glucose monitoring for a while now. Last year, it developed a method for monitoring blood glucose levels using a method called Raman spectroscopy. The process uses lasers to identify chemical composition, and according to Samsung, it demonstrates the “highest prediction accuracies among non-invasive technologies.”

Also read: The best smartwatches you can buy right now

A similar patented spectroscopy system was recently presented on a prototype smartwatch at CES 2021. The watch, made by a Japanese startup named Quantum Operations, gives out blood sugar readings in just 20 seconds.

Samsung could see a sizeable uptick in its smartwatch sales if and when the new feature lands on its Galaxy watches. According to the CDC’s latest findings, one in 10 Americans have diabetes and one in three have prediabetes.

ETNews reports that Samsung will unveil three new wearables at its next Unpacked event. It’s unclear if all of them will bundle the ability to track blood glucose levels, but given the feature’s novelty, we expect to see it on Samsung’s premium Galaxy Watch 3 successor.

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