Worksheets and No Prep Teaching Resources
Worksheets and No Prep Teaching Resources
Reading Comprehension Worksheets
Dinosaurs
Why Did the Dinosaurs Die Out?

Dinosaurs
Dinosaurs


Why Did the Dinosaurs Die Out?
Print Why Did the Dinosaurs Die Out? Reading Comprehension


Reading Level
     edHelper's suggested reading level:   grades 7 to 8
     Flesch-Kincaid grade level:   7.16

Vocabulary
     challenging words:    supercontinent, ecologists, paleontologists, radiation, supernova, dating, extinction, gathering, violent, geologists, theory, atmosphere, shortage, evidence, interesting, affected
     content words:    North America, Alvarez Hypothesis, Cretaceous Period

Other Languages
     Spanish: ¿Por qué se extinguieron los dinosaurios?


Why Did the Dinosaurs Die Out?
By Sharon Fabian
  

1     Why did all of the remaining dinosaurs die out suddenly at the end of the Cretaceous period? There is a short answer and a long answer to this question.
 
2     Here is the short answer. No one knows for sure.
 
3     Here is the long answer. There are a number of theories. Some are scientific, and some are ridiculous. Most scientists believe in one or two main ones, but no one knows for sure.
 
4     The reason no one knows for sure is because the whole thing happened about 65 million years ago. No one was around to see or hear what was going on back then, and no one was around to keep records.
 
5     What we do know comes mainly from fossil records. Scientists study the fossils themselves, and they study the rock in which the fossils are found. Fossil records haven't given us definite proof for any one theory. This is because there are some problems with fossil records. For one thing, most fossil evidence of dinosaurs has been found in North America. We don't know as much about dinosaur activity on other parts of the earth. Another problem is that it is very hard to date fossils. Dating fossils means determining how old they are.

Paragraphs 6 to 14:
For the complete story with questions: click here for printable



Weekly Reading Books

          Create Weekly Reading Books

Prepare for an entire week at once!


Feedback on Why Did the Dinosaurs Die Out?
Leave your feedback on Why Did the Dinosaurs Die Out?  (use this link if you found an error in the story)



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  
 
 
    Moon  
 
    Natural Disasters  
 
    Photosynthesis  
 
    Plant and Animal Cells  
 
    Plants  
 
    Rocks and Minerals  
 
    Science Process Skills  
 
    Scientific Notation  
 
    Seasons  
 
    Simple Machines  
 
    Soil  
 
    Solar System  
 
    Sound  
 
    Space and Stars  
 
    Sun  
 
    Tsunami  
 
    Volcanoes  
 
    Water Cycle  
 
    Water  
 
    Weather  
 



Copyright © 2017 edHelper