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New “unprecedented” animations of the Earth show how the planet’s surface has shifted and changed over the past 100 million years. 

These animations are the most detailed view of the history of Earth’s topography ever, depicting the rise of mountains, the development of basins, and the transport of large masses of sediments around the globe through erosion.  

The animations show the movements of tectonic plates, the large rafts of crust that bump up against each other to form mountain ranges and pull apart to form ocean basins. When these plates dive into the mantle, or Earth’s middle layer, at subduction zones they give rise to planet-shaping volcanoes and earthquakes. But there are other forces shaping the surface, too: Precipitation erodes away the surface, while the rate of weathering alters levels of carbon dioxide in the air, creating a feedback loop that links the land to the atmosphere. 

“While the dance of the continents has been studied extensively, we are still limited in our understanding and representation of how the Earth’s surface has evolved,” said Tristan Salles (opens in new tab) , a senior lecturer in geosciences at the University of Sydney and the lead author of a new paper describing the model, which was published March 2 in the journal Science (opens in new tab) .

“What we bring with this new model,” Salles wrote in an email to Live Science, “is a way to evaluate how this surface has changed (globally and over geological time scales) shaped by its interactions with the atmosphere, the hydrosphere, the tectonic and mantle dynamics.”

Related: A tiny magma blob may rewrite Earth’s history of plate tectonics

The model begins 100 million years ago in the midst of the breakup of the supercontinent Pangaea, which started to occur around 200 million years ago. In the beginning of the animation, the continents that will become Africa and South America are already recognizable, with the Northern Hemisphere continents coming together tens of millions of years later. Blue shows the flow of water, while red shows the intensity of the deposition of new sediments by erosion. 

“This unprecedented high-resolution model of Earth’s recent past will equip geoscientists with a more complete and dynamic understanding of the Earth’s surface,” study co-author Laurent Husson (opens in new tab) , a geologist at the Institute of Earth Sciences (ISTerre) in Grenoble, France, said in a statement (opens in new tab) .

Putting together all of these different pressures on the evolution of Earth, from the movements of the plates to the flow of water to the slow changes in the mantle, provides a new way to ask questions about everything from the regulation of the climate to the ways the circulation of the atmosphere affect erosion on land. Related Stories —Oldest evidence of tectonic plates unearthed, sealed in ancient crystals

—Plate tectonics are 3.6 billion years old, oldest mineral on Earth reveals

—Evidence of ‘modern’ plate tectonics dating to 2.5 billion years ago found in China 

The researchers found that the rate of sediment movement across the globe was likely much larger than what scientists believe based on observation, probably because the sedimentary record is fragmented. Overall erosion rates have been fairly steady for the past 100 million years, Salles said, but there have been changes in whether the sediment ends up trapped in low-elevation basins on land or ultimately flows out to sea. For example, there was a doubling of sediment flow to the oceans between about 60 million and 30 million years ago, which was likely associated with the rise of the Himalaya Mountains and the Tibetan Plateau, the researchers wrote. 

Such nuances could be important, Salles said. For example, some of the earliest life formed in shallow marine environments, where microorganisms harnessed photosynthesis for the first time and left behind mineralized formations known as stromatolites. 

“It is thought that sedimentation flux may have provided a source of nutrients to these early organisms, allowing them to thrive and evolve over time,” Salles said. “We envision that our model could be used to test such long-standing hypotheses regarding the origin of life on Earth.”

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Trump pauses tariffs on most goods from Mexico and some from Canada

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Trump pauses tariffs on most goods from Mexico and some from Canada

Donald Trump has announced that most goods imported from Mexico and some from Canada are to be exempt from his trade tariff regime for at least four weeks, just days after the charges were imposed.

“We are working hard, together, on the border, both in terms of stopping illegal aliens from entering the United States and, likewise, stopping fentanyl,” the president posted on his Truth Social platform after first relaxing his sanctions against Mexico.

He often gives both issues as reasons for the tariffs.

The latest climbdown came after he surprised financial markets 24 hours earlier by waiving tariffs against carmakers following pleas from motor industry bosses.

Money latest: Why are there no bananas in Tesco?

The White House said that 62% of Canadian imports would still be subject to 25% tariffs because they were not compliant with a trade deal – USMCA (US Mexico and Canada) – struck in 2020.

News that Canadian goods which met the USMCA criteria were being spared tariffs until 2 April followed hours after the same concession was agreed between Mr Trump and his Mexican counterpart.

A tariff of 10% was to remain on potash – a fertiliser used by farmers – and Mr Trump added that the auto tariffs would definitely return next month.

The White House revealed some details. Parts due to flow into the US from Mexico and Canada as part of the manufacturing supply chain would not qualify for tariffs so long as they complied with the USMCA deal.

‘Rules of origin’ guidelines under the agreement allow goods to move between the three countries tariff-free if they qualify with a designation that they were made in North America.

US commerce secretary Howard Lutnick told Sky’s US partner network CNBC that, taken together, more than half of usual cross border trade volumes would be exempt under the expanded concessions.

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Why are tariffs such a big deal?

He too signalled there were signs of progress in the dispute with America’s closest trading partners, saying each had worked hard to make progress in tackling imports of Fentanyl – blamed for high crime and deaths in US communities.

But Mr Lutnick explained that, as things stand, the reprieve would only last until 2 April when the Trump administration plans to impose reciprocal tariffs – on top of the 25% charges that came into force on Tuesday.

At the same time, Mr Trump is under intense pressure to relax his tariff regime permanently amid a backlash from US firms and financial market investors who fear it is self defeating.

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A closely-watched forecast has even suggested that the threats of a trade war were enough to push the US economy into recession before Mr Trump took office.

The dollar has sunk in value and US government borrowing costs have risen on the back of the turmoil.

US stock markets were also feeling the pressure again with the tech-heavy Nasdaq on course to fall by more than 3% on the day.

It is widely expected that the European Union will be next to face tariffs – possibly from 2 April – after Mr Trump threatened action “very soon” just last week.

Commenting on the threat to the eurozone from such a move, the president of the European Central Bank Christine Lagarde said on Thursday: “Just the threat of those tariff increases and potential retaliations are putting a brake on – on investment, on consumption decisions, on employment, hiring, all the rest of it.”

While Mr Trump has not issued a specific threat against the UK, her counterpart at the Bank of England Andrew Bailey told a committee of MPs on Wednesday that the US should work “multi-laterally” rather than bilaterally to resolve its disputes.

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US ‘destroying’ international rules-based order by trying to meet Russia ‘halfway’, Ukraine’s UK ambassador warns

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US 'destroying' international rules-based order by trying to meet Russia 'halfway', Ukraine's UK ambassador warns

The United States is “finally destroying” the international rules-based order by trying to meet Russia “halfway”, Ukraine’s ambassador to the UK has warned.

Valerii Zaluzhnyi said Washington’s recent actions in relation to Moscow could lead to the collapse of NATO – with Europe becoming Russian President Vladimir Putin‘s next target.

“The failure to qualify actions of Russia as an aggression is a huge challenge for the entire world and Europe, in particular,” he told a conference at the Chatham House think tank.

Ukraine latest: ‘Watershed moment’ as Kremlin blasts Macron

“We see that it is not just the axis of evil and Russia trying to revise the world order, but the US is finally destroying this order.”

Valerii Zaluzhnyi. Pic: Reuters
Image:
Valerii Zaluzhnyi. Pic: Reuters


Mr Zaluzhnyi, who took over as Kyiv’s ambassador to London in 2024 following three years as commander-in-chief of the Ukrainian armed forces, also warned that the White House had “questioned the unity of the whole Western world” – suggesting NATO could cease to exist as a result.

It comes as Ukrainian President Volodymyr Zelenskyy scrambles to repair relations with US President Donald Trump following a dramatic row between the two men in the Oval Office last week.

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Mr Trump signalled on Tuesday that tensions could be easing, telling Congress he had received a letter from Mr Zelenskyy saying he was ready to sign a peace deal “at any time”.

Zelenskyy and Trump speaking in the Oval Office. Pic: Reuters
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Zelenskyy and Trump during their extraordinary Oval Office row. Pic: Reuters

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But on the same day, the US president ordered a sudden freeze on shipments of US military aid to Ukraine, and Washington has since paused intelligence sharing with Kyiv and halted cyber operations against Russia.

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Mr Zaluzhnyi said the pause in cyber operations and an earlier decision by the US to oppose a UN resolution condemning Russian aggression in Ukraine were “a huge challenge for the entire world”.

He added that talks between the US and Russia – “headed by a war criminal” – showed the White House “makes steps towards the Kremlin, trying to meet them halfway”, warning Moscow’s next target “could be Europe”.

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Lesotho minister calls Trump ‘insulting’ for saying nobody has heard of country

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Lesotho minister calls Trump 'insulting' for saying nobody has heard of country

Lesotho’s foreign minister has said it is “insulting” for Donald Trump to say nobody has heard of the country. 

In his address to the US Congress on Tuesday, the US president mentioned Lesotho while listing some of the foreign spending he had cut as “appalling waste”.

“Eight million dollars to promote LGBTQI+ in the African nation of Lesotho, which nobody has ever heard of,” Mr Trump said, drawing laughs in the Congress.

The president also appeared to struggle to pronounce the country’s name.

Lesotho’s foreign minister, Lejone Mpotjoane, said: “I’m really shocked that my country can be referred to like that by the head of state.

“Lesotho is such a significant and unique country in the whole world. I would be happy to invite the president, as well as the rest of the world, to come to Lesotho,” Mr Mpotjoane told the Reuters news agency.

He later told The Associated Press: “It is surprising and disappointing that he claimed no one knows Lesotho, especially given that the US has an embassy here.

“He should speak for himself and not generalise.”

The Trump administration has cut billions of dollars in foreign aid worldwide as part of the president’s America First policy.

Lesotho, which has a population of around 2.3 million people, has received American assistance for nearly 20 years through USAID, which gave it more than $44m (£34.1m) last year.

A general view of the Maluti Mountains in Butha Buthe, Lesotho, July 31, 2021. Picture taken July 31, 2021. REUTERS/ Sumaya Hisham
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The Maluti Mountains in Butha Buthe, Lesotho. File pic: Reuters/Sumaya Hisham

Water levels are seen at the Katse dam in Lesotho, January 28, 2018. Picture taken January 28, 2018. REUTERS/Victor Antonie
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The Katse dam in Lesotho. File pic: ReutersVictor Antonie

Mr Mpotjoane said while civil society organisations funded by the US embassy in Lesotho did work to support the LGBT+ community, the US also provided important funding to the country’s health and agriculture sectors.

The cuts have forced Lesotho’s HIV programme to lay off at least 1,500 health workers – about 7% of the country’s health staff – in what the government has described as a severe blow.

US aid has been credited with helping Lesotho provide life-saving treatment to more than 200,000 people living with HIV.

Mr Mpotjoane said the government was looking at how to become more self-sufficient.

“The decision by the president to cut the aid… it is [his] prerogative to do that. We have to accept that. But to refer to my country like that, it is quite unfortunate.”

This wasn’t the first time Mr Trump has reportedly been disparaging about Africa. During his first term, it was reported that he referred to African nations, as well as Haiti and El Salvador, as “shithole countries” – though Mr Trump denied this.

Elon Musk, a key adviser to Mr Trump and proponent of the foreign aid cuts in his role as head of the new department of government efficiency, has been trying to do business in Lesotho in recent months.

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Mr Musk’s Starlink internet satellite service, a subsidiary of SpaceX, has applied for a license to operate in Lesotho. It is one of several African countries where the company is bidding to win contracts.

The Lesotho Communications Authority said last month it recently received Starlink’s bid for a 10-year license.

Prince Harry also co-founded the charity Sentebale to support children who live in extreme poverty or suffer from HIV/AIDS in Lesotho.

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