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.”
Tennessee‘s Nico Iamaleava has been cleared medically to play Saturday against Georgia and is set to return as the Vols’ starting quarterback, sources told ESPN.
Iamaleava, a redshirt freshman, missed the second half of the 33-14 win over Mississippi State last week after suffering a blow to the head. He was listed as questionable earlier this week on the SEC availability report but has been removed in the latest report.
Iamaleava practiced this week, including team periods, and there was optimism among the staff that he was trending in the right direction and would be able to play. But the final call was made by medical personnel. Iamaleava was examined by doctors for what sources told ESPN were concussion-like symptoms after leaving the Mississippi State game. He did not return to the sideline for the second half.
Tennessee coach Josh Heupel said on Monday that he felt like Iamaleava would be in “great shape for Saturday” and noted that Iamaleava was with the team earlier Monday morning for meetings and team activities. The Vols’ first full-scale practice was Tuesday.
Iamaleava was having his most productive outing against an SEC team this season before leaving the game against Mississippi State. He completed 8 of 13 passes for 174 yards, no interceptions and a pair of touchdowns as Tennessee built a 20-7 halftime lead. In Iamaleava’s previous five SEC games, he had accounted for three touchdowns and turned it over five times. He was also sacked 15 times in those five games.
Redshirt senior Gaston Moore filled in for Iamaleava in the second half last week and finished 5-of-8 for 38 yards with no touchdowns or interceptions.
Getting Iamaleava back for the Georgia game is big news for Tennessee, which is right in the middle of the SEC championship race and College Football Playoff picture.
Receiver Dont’e Thornton (hand) has also been given the green light to play for Tennessee after earlier being listed as questionable.
Week 12 is here as we take a look at an SEC matchup that has College Football Playoff implications, learn about three of the nation’s top passers who all played under the same coach and see what’s going on in the Big 12.
No. 7 Tennessee will visit Sanford Stadium as it takes on conference opponent No. 12 Georgia on Saturday night. With so much at stake, what can each team improve on ahead of this SEC showdown?
The Big 12 has six teams in the hunt for a spot in the conference title game. With the final CFP rankings coming out in less than a month, what scenario looks most realistic for the conference in terms of how many of its teams could make the 12-team field?
Our college football experts preview big games and storylines ahead of the Week 12 slate.
It has been a historic (and dominant) season for Tennessee’s defense, which has yet to give up more than 19 points in any of its nine games. Against SEC competition, the Volunteers lead the conference in scoring defense, giving up 16.7 points per game, and also lead the way in third-down defense and red zone defense. In other words, they’ve given up very little of anything on defense and are buoyed by a line that’s both talented and deep. Tennessee plays a ton of players up front and has been especially good at forcing key turnovers. In 23 trips inside its own 20-yard line, the Vols have forced six turnovers.
The reality is that Tennessee has played to its defense for much of this season out of necessity. The offense has lacked consistency and struggled to generate explosive plays, particularly in the passing game. It’s not all on redshirt freshman quarterback Nico Iamaleava, either. Iamaleava has thrown only five touchdown passes in six SEC games, and the Vols are tied for 10th with an average of 7.5 yards per completion. Iamaleava, who sustained a head injury in a win over Mississippi State last week, has been the victim of poor pass protection at times, and his receivers have dropped some costly passes. Iamaleava has also been shaky when it comes to overthrowing receivers and occasionally holding onto the ball too long.
The bright spot on offense for Tennessee has been running back Dylan Sampson, who has a school-record 20 rushing touchdowns. He has been a constant for the Vols on offense and has an SEC-leading 772 rushing yards and 11 touchdowns in conference play. As good as he has been, the Vols are probably going to need more from their passing game to win in Athens. — Chris Low
The Bulldogs didn’t do much of anything well in last week’s 28-10 loss at Ole Miss, which was the first time in a long time that Kirby Smart’s team was manhandled on the lines of scrimmage.
The good news for Georgia: It’s heading home to Sanford Stadium for the first time in more than a month. Georgia hasn’t dropped back-to-back games in the regular season since 2016, Smart’s first season, and it has bounced back after each of its past eight losses. The Bulldogs have won seven of their past eight games against the Volunteers.
For all of quarterback Carson Beck‘s turnovers, Georgia’s problems on offense probably start up front. The offensive line hasn’t done a good job of protecting him, and the Bulldogs’ lack of a potent running game has prevented them from effectively utilizing play-action passes. Their banged-up offensive line is going to face another formidable defensive front Saturday. Georgia has 27 dropped passes, fourth most in the FBS, according to TruMedia, so its receivers need to become more reliable as well. — Mark Schlabach
The coach behind three of college football’s top passers
North Texas coach Eric Morris coached Ward at Incarnate Word and Washington State, recruited Mateer to the Cougars and signed Morris out of the transfer portal this offseason. All three hailed from Texas and are putting up big numbers this season. Morris, a Mike Leach disciple, knows what he’s looking for when it comes to QBs.
For each one, the journey was different. Ward was a zero-star recruit out of West Columbia, Texas, played in a wing-T offense and had no scholarship offers. But he showed up to Incarnate Word’s camp in 2019 and impressed with his quick release and accuracy. Morris saw appealing traits, too, in Ward’s multisport talents.
“He was such a good basketball player,” Morris said. “He was a bigger guy who could really handle the ball and move with ease. He had a twitch and quickness about him that was almost Mahomes-esque, where he’s not fast but you see him get out of the pocket and scramble and he’s nifty on his feet. He saw the floor great and shot the basketball great.
“It might be easier at an FCS school to take that risk, but it was something we were really confident in.”
Ward came in with extreme confidence, telling coaches he’d win the starting job over their returning all-conference player (and he did). He followed Morris to Pullman, Washington, out of loyalty to the coach who believed in him. Now he’s playing on a big stage, chasing a College Football Playoff bid and a Heisman Trophy with the No. 9 Hurricanes.
“It’s been fun to watch him flourish and get rewarded for being patient all these years,” Morris said.
When Morris left UIW to become Washington State’s offensive coordinator in 2022, he brought Ward but needed another QB. On his first recruiting trip in Texas, he stopped by to check out Mateer. The two-star recruit had a prolific senior season at Little Elm High School but was committed to Central Arkansas. Morris didn’t understand what FBS programs were missing and convinced Mateer to flip.
After two seasons behind Ward, Mateer has emerged as one of the top dual-threat QBs in college football with 2,332 passing yards, 805 rushing yards (excluding sacks) and 33 total TDs.
“I think the sky’s the limit,” Ward said. “He’s just so dang hard to tackle in the open field. Just a kid that loves ball and was under-recruited. The tide’s turned and he ends up being a big-time ballplayer.”
Chandler Morris was not an under-the-radar talent, but he’s having his best season yet at North Texas. He began his career at Oklahoma, won the starting job at TCU in 2022, sustained a knee injury in its season opener and then watched Max Duggan lead the Horned Frogs to the national title game.
Morris had a six-game stint as TCU’s starter last season before injuring the same knee. At UNT, he’s leading the nation’s No. 3 passing offense with 3,244 total yards and 30 TDs. Like Ward and Mateer, he processes information quickly, makes plays with his feet and throws outside the pocket with accuracy. If you ask Eric Morris, those traits are a must in today’s game. When paired with his version of Air Raid ball, you get big-time results.
“It’s been fun to see him get his swagger back,” Morris said.
Eric Morris points to Patrick Mahomes, Lamar Jackson and Jayden Daniels. The QBs thriving at the highest level are becoming unstoppable by creating plays out of the pocket. And so are his guys.
“Everybody obviously watches Cam and the magic he makes,” Morris said, “but I think all three of ’em can make plays when it’s not a perfect play call. There are a bunch of really good pure passers nowadays, but that’s what sets them all apart.” — Max Olson
What’s going on in the Big 12?
Two-thirds of the way through the Big 12 schedule, six teams are still in the hunt for a title-game appearance: BYU (6-0), Colorado (5-1), Arizona State, Iowa State, Kansas State and West Virginia, all of which are 4-2. There are too many variables to discuss all the scenarios, but the conference has a straightforward tiebreaker policy.
It’s possible to come up with scenarios in which the Big 12 could get two bids, one bid or shut out altogether.
For the Big 12 to get two bids, BYU probably would have to finish 12-0, then lose a close game in the championship to a two-loss team (Colorado, Iowa State or Kansas State). A 12-1 BYU team would get consideration, but it would become a question of how far it would fall and what else happens around the country.
The most likely scenario is the Big 12 will get one team in: whichever one wins the conference title game. If BYU wins out, it will have a bye, but if it slips up even once — or if another team wins the title — Boise State might be in position to get a first-round bye, assuming the Broncos win out.
The doomsday scenario in the Big 12 is if the conference champion has two or three losses and Army and Boise State win out. If that’s the case, there is a good possibility both of those schools would be ranked ahead of the Big 12 champion and the Big 12 would be left out. — Kyle Bonagura
Quotes of the Week
“They’re stubborn, man. They’re physical. He is an elite runner. The runs they run are sometimes nontraditional. They run some runs that other people don’t run because of the space in the box. He’s very patient. He hits small creases. He’s hard to tackle. How many touchdowns has he got in the SEC? Twenty-something? That’s crazy. In the SEC? The SEC is the hardest league in the world to run the ball in on because they’ve got the most size defensive lineman, and he continues to do it at a crazy pace to me.” — Kirby Smart on Volunteers tailback Dylan Sampson.
“I never try to take a step back. I try to take a step up. I’m always putting my head out the window. I’m trying to see around the corner, not trying to see straight ahead. It’s normalcy for everybody to see what’s in front of them. I’m trying to see around the corner. That’s the relationship I have with the Lord, to help me see around the corner so I can help navigate these young men as well as the women that’s attached to our program to a better way and a better life. So I don’t get caught up in the ‘You go, boys!’ or the ‘You ain’t nothing.’ You know, if I would’ve listened to you guys earlier, I’ve gotta listen to you now. So I might as well just put some headphones on and block you out. Notice I don’t have a sponsor for headphones, but that would’ve been a good placement for a sponsor.” — Deion Sanders when asked if he takes time to step back and appreciate the magnitude of Colorado’s turnaround.
“I hope anyone who has ambitions about playing in the National Football League, let’s see what you’ve got against Clemson. Let’s see you play your best game here. If you weren’t focused for Virginia, which I can’t imagine you weren’t — and I’m not saying anybody was not focused — but if they didn’t get your focus, I imagine Clemson will get your focus when you put the tape on.” — Pitt coach Pat Narduzzi on whether playing Clemson gets the attention of his players.
On today’s informative episode of Quick Charge, we’ve got Honda engineers Jason Hwang and Emilio Sanchez to talk us through some of the things that make the GM Ultium-based Honda Prologue EV feel like a real Honda, and why that matters.
Jason and Emilio talk about some of the choices they made to make the Honda Prologue and Acura ZDX feel different from its GM-branded cousins, and explain why this was much more than a case of badge-engineering. Give it a listen, then let us know what you think of the Prologue and ZDX in the comments.
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