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Dinosaurs
When Did Dinosaurs Live?



When Did Dinosaurs Live?

A Short Reader

Reading Level
     edHelper's suggested reading level:   grades 6 to 8
     Flesch-Kincaid grade level:   5.71

Vocabulary
     challenging words:    lizard-like, comet, ichthyosaurs, pterosaurs, asteroid, mass, between, million, lasted, impact, debris, early, history, adapt, soil, died
     content words:    Mesozoic Era


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When Did Dinosaurs Live?
By Cindy Grigg
  

1     Dinosaurs lived between ~250 million and ~65.5 million years ago. This huge time period is called the Mesozoic Era. Mesozoic means "middle life." The Mesozoic has been called "The Age of Dinosaurs."
 
2     The Mesozoic is divided into three periods. The first is the Triassic. It was between 250 and 205 million years ago. The Jurassic lasted from 205 to 145 million years ago. The Cretaceous lasted from 145 to 65.5 million years ago. (The years of each are ~approximate.) Different kinds of dinosaurs evolved during the millions of years of the Mesozoic. Some became extinct early in that era. Other kinds appeared later in the fossil record.
 
3     Dinosaurs were not the only animals that lived on Earth during the Mesozoic. Dinosaurs walked on land. Some large lizard-like animals that were not dinosaurs flew in the sky (pterosaurs) and swam in the seas (plesiosaurs and ichthyosaurs). There were insects, fish, frogs, and crocodiles. Birds and small, furry mammals lived at this time, too. There were no people living when the dinosaurs lived.

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Dinosaurs
             Dinosaurs


Science
             Science


    Careers in Science  
 
    Caring for Earth  
 
    Clouds  
 
    Dinosaurs  
 
    Earth's Land  
 
    Earth  
 
    Earthquakes  
 
    Electricity  
 
    Energy  
 
    Erosion  
 
    Food Pyramid  
 
    Food Webs and Food Chain  
 
    Forces and Motion  
 
    Fossils  
 
    Health and Nutrition  
 
    How Things Work  
 
    Landforms  
 
    Life Science  
 
    Light  
 
 
    Magnets  
 
    Matter  
 
    Natural Disasters  
 
    Photosynthesis  
 
    Plant and Animal Cells  
 
    Plants  
 
    Rocks and Minerals  
 
    Science Process Skills  
 
    Seasons  
 
    Simple Machines  
 
    Solar System  
 
    Sound  
 
    Space and Stars  
 
    Tsunami  
 
    Volcanoes  
 
    Water Cycle  
 
    Water  
 
    Weather  
 


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