Importance of Natural Resources

What Happened to the Dinosaurs?

♪ Clues, clues, lookin’ for clues… Oh! It’s you! Hi! You were probably expecting Jessi, right? Well, she and Squeaks will be back next time,
but right now they’re off doing a bit of detective work in Yucatán,, Mexico! You might say they’ve flown south for the
winter. And of course I approve of that! Very bird-like of them. You see, we teamed up because we got curious
about one of the greatest mysteries of all time:
What happened to the dinosaurs? If you know me, you know that I loooove dinosaurs. And a long time ago — around 65 million
years! — the dinosaurs were large and in charge. They had ruled the Earth for over 160 million
years. And then, something strange happened, not
just to dinosaurs, but to over half the Earth’s species. That means a type of living thing, like oak
trees, or cuckoo birds like me, or humans like you. All at once, about 65 million years ago, a
bunch of different species just went extinct — they were completely wiped out! That’s because something big happened, causing
huge changes on Earth. Changes in the weather, changes in the oceans
… changes that made it harder for dinosaurs and other living things to find food and survive. Sure sounds mysterious! Most species will go extinct sometime, but
what I wanna know is: What happened? What caused so many species – from tiny
ocean creatures to big land reptiles like T-rex and Triceratops – to all go extinct
at the same time? Scientists don’t know for sure, but they
have a few different guesses. Some scientists think it happened because
of a giant rock moving through space, called an asteroid, that crashed into the Earth. As it happens, that’s just what Jessi and
Squeaks went to Mexico to learn more about! And Jessi’s giving us a call right now! How’s your vacation, Jessi? Jessi: Terrific, Dino! Squeaks and I are here at the Yucatán Peninsula
in Mexico, and we’re learning so much! We learned that 65 million years ago, an asteroid
blasted in from outer space and landed right here! This asteroid was enormous — it was 12 kilometers
wide, so big that it would take hours just to walk from one side to the other. And when it landed, the explosion left an
even bigger crater — a big bowl-shaped dent in the Earth. It’s called the Chicxulub crater, and it’s
about 150 kilometers wide. The explosion sent lots of rocks and other
debris raining down on anything nearby. And it sent billions of tons of soot into
the air! Soot is the dusty stuff that’s left over
when something burns up, Dino: That’s one powerful explosion! Jessi: It sure was! It made the whole world really hot for a few
days. And it started fires, giant waves, and huge,
strong winds; and it shook the Earth, in a super powerful earthquake! Dino: Thanks for the hot tips, Jessi. Enjoy the rest of your trip! Now, some scientists think that the explosion
from the asteroid sent so much soot into the air that it blocked out the Sun. For a while, it was really dark outside, even
during the day! And without sunshine, it started to get cold,
which meant some of the living things that were used to warmer weather couldn’t survive. There was another problem, too: plants need
sunlight to live, so a lot of the plants back then died. Without plants, the animals that ate plants
didn’t have enough food, and without enough plant-eaters, the animals that ate meat went
hungry too. That’s why some scientists think the asteroid
was what caused the dinosaurs to go extinct! But other scientists think there may have
been another cause, and that even before that asteroid crashed into the Earth, disaster
was in the air for the dinosaurs. And they think the culprit was … volcanoes! Because right around the time that the dinosaurs
went extinct, one of the biggest volcanic eruptions in history was underway, in the
area of the world that’s now India. For close to a million years, eruptions sent
rocks and dust and soot onto the land and into the air. Just like with the asteroid impact, all this
stuff in the air would have blocked out the Sun, making the Earth cooler and darker. So we don’t know for sure what darkened
the skies and wiped out all those species — it could have been the asteroid, or it
could have been the volcanoes, or both! We have so many clues, but the true culprit
is going to remain a mystery… for now. Either way, the dinosaurs were pretty unlucky! A lot of things went very wrong for them,
all at the same time. But even though life was hard, some types
of plants and animals were able to find food and shelter while the Earth was changing,
and they survived! Whatever happened all those years ago, life
on Earth goes on, and we’re all here, solving mysteries together! Do you have any big mysteries you’re wondering
about? Ask a grownup to help you and leave a comment
below, or send us an email at [email protected] And if you want to join us next time, hit
that subscribe button!

Reader Comments

  1. What happened to the dinosaurs? Who cares?! What happened to S06E10 of The Americans! That's what I'm talkin bout.

  2. my son loves to watch this all the time thanks for learning about dinosaurs he didn't even know about me anything about it thank you

  3. Cool.thank you..hi iam channel pulang sekolah ..content education format animation from Indonesia..nice to meet you

  4. Can we get too little sugar and is sugar actually helpfull to our body?


  5. i think that the most big mistery is: How did the mayas died or how did they where born thats a real mystery

  6. Yayyyyyyyyyyyyyyyyyyyuuuyyyuuuuuuuuuuuuuuuuuuuuyyyyuuuyyyyyyyyyyyyyyyyyyuyyyyyyyyyyyyyyyyyyyuyyyyyyyyyyyyyuyyyyuyuuuyyyuyyuuuyyyyuyyyyyyyyyyyyyyyyyyyyyuuyyyyyuyyyyyyyyyyyyyyyyyyyuyyyuuyyyyyyyyy

  7. Questions from my sons Ashton and Owen

    "How did humans get on earth?"

    "Why does the earth move?"

    "How was cement discovered?"

    "Who discovered Canada?"

    "How does our bodies grow from babies to adults?"

    "Why isn't everything free in the world?"

    "How did people discovery electricity?"

    "What happens to your body when you get an electric shock?"

    "How does hair grow so fast?"

    "Does space have an ending?"

    "How does electricity run through wires"

    "How do eyeballs see"

    "How does our brain know how to control our body and thoughts?"

  8. That is not how my fellow dinosaurs, marine reptiles, and ptersaurs went extinct, also, the extinction did not occur 65 million years ago or so.

  9. A flood. God sent a flood to kill all of the people who didn't listen to him and Noah and his family built an ark because God told him to!😊

  10. I’m a Christian, and honestly, I believe that God was planning to put humans on Earth, but he knew we’d have no chance of survival with dinosaurs living here. So he had to wipe them out somehow.

  11. You're very wrong dinosaurs are not extinct you know bird are dinosaurs and you meet dinosaurs everyday without noticing

  12. What Happened to the Dinosaurs?

    “PALAEONTOLOGY is the study of fossils, and fossils are the remains of life from past ages.” But as one paleontologist said, it is “a highly speculative and opinionated science.” This is evident regarding dinosaurs. Listing some speculations as to what happened to them, Princeton scientist G. L. Jepson stated:

    “Authors with varying competence have suggested that dinosaurs disappeared because the climate deteriorated . . . or that the diet did. . . . Other writers have put the blame on disease, parasites, . . . changes in the pressure or composition of the atmosphere, poison gases, volcanic dust, excessive oxygen from plants, meteorites, comets, gene pool drainage by little mammalian egg-​eaters, . . . cosmic radiation, shift of Earth’s rotational poles, floods, continental drift, . . . drainage of swamp and lake environments, sunspots.”​—The Riddle of the Dinosaur.

    It is apparent from such speculations that scientists are not able, with any certainty, to answer the question: What happened to the dinosaurs?

    Sudden Extinction Theory

    A more recent theory was put forth by a father-​and-​son team, Luis and Walter Alvarez. Walter Alvarez discovered, outside the town of Gubbio in central Italy, a curious thin, red layer of clay sandwiched between two limestone layers in the rock formation. The lower layer of limestone yielded an abundance of fossils. The top layer was almost devoid of fossils, leading the geologists to conclude that life suddenly disappeared and that the thin, red layer of clay had some connection with the extinction.

    Analysis revealed that the clay was rich in iridium (a metal), 30 times richer than the concentration normally found in rocks. They knew that such high concentrations of this rare element could come only from the earth’s core or from sources outside the earth. They concluded that the iridium was deposited by a huge asteroid that hit the earth, causing the sudden extinction of the dinosaurs.

    After the discovery of the iridium-​enriched clay at Gubbio, similar deposits were found in other parts of the world. Did this corroborate the asteroid hypothesis? Some scientists remain skeptical. But as the book The Riddle of the Dinosaur acknowledges, the Alvarez hypothesis added “fresh yeast to the study of extinction and evolution.” And paleontologist Stephen Jay Gould admits that it could diminish “the importance of competition between species.”

    Commenting on this new theory and the apparently sudden extinction of the dinosaurs, one science writer admits: “They could shake the foundations of evolutionary biology and call into question the current concept of natural selection.”

    University of Arizona scientist David Jablonski concludes that ‘for many plants and animals, extinction was abrupt and somehow special. Mass extinctions are not merely the cumulative effects of gradual dyings. Something unusual happened.’ Their arrival was also abrupt. Scientific American observes: “The sudden appearance of both suborders of the pterosaurs without any obvious antecedents is fairly typical of the fossil record.” That is also the case with dinosaurs. Their relatively sudden appearance and disappearance contradicts the commonly accepted view of slow evolution.

    The Dating of Dinosaurs

    Dinosaur bones are regularly found in lower earth layers than are human bones, leading many to conclude that they belong to an earlier time period. Geologists call this time the Mesozoic period and subdivide it into the Cretaceous, Jurassic, and Triassic periods. The time frames used for these periods are on the order of tens of millions of years. But has this been established with any certainty?

    One method being used to measure the age of fossils is called radiocarbon dating. This dating system measures the rate of decay of radioactive carbon from the point of death of the organism. “Once an organism dies, it no longer absorbs new carbon dioxide from its environment, and the proportion of the isotope falls off over time as it undergoes radioactive decay,” states Science and Technology Illustrated.

    However, there are severe problems with the system. First, when the fossil is considered to be about 50,000 years old, its level of radioactivity has fallen so low that it can be detected only with great difficulty. Second, even in more recent specimens, this level has fallen so low that it is still extremely difficult to measure accurately. Third, scientists can measure the present-​day rate of radioactive carbon formation but have no way of measuring carbon concentrations in the distant past.

    So whether they use the radiocarbon method for dating fossils or other methods, such as employing radioactive potassium, uranium, or thorium, for dating rocks, scientists are unable to establish the original levels of those elements through ages of time. Thus, professor of metallurgy Melvin A. Cook observes: “One may only guess these concentrations [of radioactive materials], and the age results thus obtained can be no better than this guess.” That would especially be so when we consider that the Flood of Noah’s day over 4,300 years ago brought enormous changes in the atmosphere and on earth.

    Dartmouth College geologists Charles Officer and Charles Drake further add doubt to the accuracy of radioactive dating. They state: “We conclude that iridium and other associated elements were not deposited instantaneously . . . but rather that there was an intense and variable influx of these constituents during a relatively short geologic time interval on the order of 10,000 to 100,000 years.” They argue that the breakup and movement of the continents disrupted the entire globe, causing volcanic eruptions, blocking sunlight and fouling the atmosphere. Certainly, such disruptive events could change radioactivity levels, thus distorting results from modern-​day radioactive clocks.

    The Genesis Account and Dinosaurs

    While the radioactive dating method is innovative, it is still based on speculation and assumption. In contrast, the Bible account in the first chapter of Genesis simply states the general order of creation. It allows for possibly thousands of millions of years for the formation of the earth and many millenniums in six creative eras, or “days,” to prepare the earth for human habitation.

    Some dinosaurs (and pterosaurs) may indeed have been created in the fifth era listed in Genesis, when the Bible says that God made “flying creatures” and “great sea monsters.” Perhaps other types of dinosaurs were created in the sixth epoch. The vast array of dinosaurs with their huge appetites would have been appropriate considering the abundant vegetation that evidently existed in their time.​—Genesis 1:20-24.

    When the dinosaurs had fulfilled their purpose, God ended their life. But the Bible is silent on how he did that or when. We can be sure that dinosaurs were created by Jehovah for a purpose, even if we do not fully understand that purpose at this time. They were no mistake, no product of evolution. That they suddenly appear in the fossil record unconnected to any fossil ancestors, and also disappear without leaving connecting fossil links, is evidence against the view that such animals gradually evolved over millions of years of time. Thus, the fossil record does not support the evolution theory. Instead, it harmonizes with the Bible’s view of creative acts of God.

    [Blurb on page 10]

    The fossil record of the dinosaurs supports not evolution but creation

  13. i love your video you make me more smart becuase of you thank you well im just 11 years old my science skill is more nice beacuse you make this video plz sub and like to SCIShow Kids

  14. If you enjoyed this video, you will also love the science videos from our friends at They make science videos and lessons for kids in Grades K-5. Check 'em out!

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