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Science 3: Mass Extinction of Dinosaurs 19 Views
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Description:
Keep a stiff upper lip, Shmoopers. Today's lesson is about how all the dinosaurs died. Before we got to ride any of them. Even once.
Transcript
- 00:04
[Coop and Dino singing]
- 00:13
Dinosaurs were magnificent creatures... [Dinosaurs in a field]
- 00:16
Majestic...
- 00:17
Elegant...
- 00:18
And uh…sometimes pretty darn scary. [T-Rex appears]
Full Transcript
- 00:20
So while it's definitely pretty sad that they aren't around today for us to enjoy, we all
- 00:24
might be a little better off without this...
- 00:26
Or this...
- 00:27
Or this...
- 00:28
Or swarms of these running around. [Dinosaurs tormenting guys on a bike]
- 00:31
But as grateful as we are to not have to worry about being some dino's afternoon snack…
- 00:36
…what happened?
- 00:37
Why are they gone?
- 00:38
Well, scientists believe a massive extinction of dinosaurs occurred around 66 million years ago. [Scientist working in a lab]
- 00:44
But while scientists agree that this extinction definitely happened, they disagree on exactly [Dinosaur disappears off a cliff]
- 00:49
how it went down.
- 00:50
For example, one popular theory is that an asteroid hit the earth around this time, wiping
- 00:54
out all of the dinosaurs on the planet. [Asteroid hitting earth]
- 00:56
Another theory is that instead of an asteroid, it was actually volcanoes throughout a large
- 01:01
area in India that caused the dinosaurs to go extinct, erupting over a period of thousands [Volcano erupting]
- 01:06
of years.
- 01:07
Yeesh…maybe someone should've given those volcanoes a Snickers….they're not themselves
- 01:11
when they're hungry.
- 01:12
Another theory is that the earth kept getting colder and colder, and because dinosaurs are [Dinosaurs shaking with cold]
- 01:16
cold-blooded, and electric blankets weren't invented yet, they weren't able to survive.
- 01:21
And some scientists think, "Hey, the more theories, the merrier," and think it was some
- 01:26
sort of combination of all three that led to the extinction of the dinosaurs.
- 01:29
But regardless of how it happened, we know that 70% of the animals that lived at this
- 01:33
time went extinct.
- 01:35
The remaining 30% of animals that survived included small rodent mammals, crocodiles, [A rodent, crocodile and a bird appear]
- 01:40
and some birds.
- 01:41
So yeah, it was a pretty tough time for life on earth.
- 01:45
The only time period that was scarier?
- 01:46
The '80s…seriously, the clothing… the hair do's.. [Man thinks about the 80's time period]
- 01:51
But it doesn't necessarily take a giant meteor or a series of volcanoes to cause a species
- 01:56
to go extinct.
- 01:57
You've probably heard of plenty of animals that are endangered or going extinct even [A polar bear laying on a rock]
- 02:01
today.
- 02:02
Recent examples of animal species that have gone extinct include the Javan Tiger,
- 02:05
the Golden Toad, and the Passenger Pigeon.
- 02:08
And there are many more species that are critically endangered and nearing extinction, including [A baboon crying]
- 02:12
the Black Rhino, the Mountain Gorilla, the Bengal Tiger, and the Leatherback Turtle.
- 02:17
What's worse is that many species are endangered because of us. [A bear dead on a log and a man appears]
- 02:21
Humans are either hunting them or destroying their habitats.
- 02:23
Yup.
- 02:24
Some humans can be the worst.
- 02:26
That's why it's so important that we do our best to protect all species of plants and
- 02:30
animals in order to keep them alive and well for years to come. [Monkey family protecting a young monkey]
- 02:33
And in case you still need to be convinced, just look at this photo of a baby leatherback turtle.
- 02:39
How can you say no to that face? [Hand holding a small leatherback turtle]
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