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Le classi terze Montessori presentano.... a.s. 2009/10 febbraio 2010 WHAT IS A DINOSAUR? When the dinosaurs lived, the Earth's continents were jammed together into a supercontinent called Pangaea and the Earth was warmer than it is now.

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Presentation Transcript
slide1

Le classi terze Montessori

presentano....

a.s. 2009/10

febbraio 2010

slide3
When the dinosaurs lived, the Earth's continents were jammed together into a supercontinent called Pangaea and the Earth was warmer than it is now.
slide5

Millions of years ago, long before there were no people, there were dinosaurs. Dinosaurs were one of several kinds of prehistoric reptiles that lived during the Mesozoic Era, the "Age of Reptiles."

slide6
Dinosaurs were reptiles and most hatched from eggs. No dinosaurs could fly and none lived in the water.
slide8
The largest dinosaurs were over 100 feet (30 m) long and up to 50 feet (15 m) tall

(like Argentinosaurus, Seismosaurus, Ultrasauros, Brachiosaurus, and Supersaurus).

The smallest dinosaurs, like Compsognathus, were about the size of a chicken. Most dinosaurs were in-between.

Butblue whales are more massive than any of the dinosaurs were!

slide9

It is very difficult to figure out how the dinosaurs sounded, how they behaved, how they mated, what color they were, or even how to tell whether a fossil was male or female

slide11
Most dinosaurs

were plant-eaters

(also called herbivores).

For example,

Triceratops was a

plant-eating dinosaur.

slide12
Some dinosaurs were meat-eaters

(also called carnivores).

For example, T. rex was a meat-eating dinosaur.

there were lots of different kinds of dinosaurs that lived at different times
There were lots of different kinds of dinosaurs that lived at different times.
  • Some walked on two legs (they werebipedal), some walked on four (theywere quadrupedal). Some could do both.
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Some were armor-plated,

some had horns, crests, spikes,or frills

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Some had thick,

bumpy skin,

and some even had primitive feathers.

slide17
The dinosaurs dominated the Earth for over 165 million years during the Mesozoic Era, but mysteriously went extinct 65 million years ago. Paleontologists study their fossil remains to learn about the amazing prehistoric world of dinosaurs
slide18
The dinosaurs went extinct about 65 million years ago, at the end of the Cretaceous period, which was a time of high volcanic and tectonic activity.

There are a lot of theories why the extinction occurred. The most widely accepted theory is that an asteroid impact caused major climactic changes to which the dinosaurs couldn't adapt.

slide19
The dinosaurs went extinct 65 million years ago, probably because of the environmental changes brought about by an asteroid hitting the Earth.
slide20
Dinosaurs probably live

on today as the birds.

All that's left of the

dinosaurs are fossils

and, perhaps,the birds.

slide22
Dinosaur fossils have

been found all over the

world, maybe even

near where you live!

slide23
There are almost 500 described dinosaur genera and many more species. Every few months (sometimes weeks), new finds are unearthed
slide24
Although dinosaurs' fossils have been known since at least 1818, the term dinosaur (deinos means terrifying; sauros means lizard) was coined by the English anatomist Sir Richard Owen in 1842.
slide25
The only three dinosaurs known at the time were Megalosaurus, Iguanodon, and Hylaeosaurus, very large dinosaurs.