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Earth
A CAT Scan of Earth

Earth
Earth


A CAT Scan of Earth
Print A CAT Scan of Earth Reading Comprehension with Sixth Grade Work

Print A CAT Scan of Earth Reading Comprehension


Reading Level
     edHelper's suggested reading level:   high interest, readability grades 6 to 8
     Flesch-Kincaid grade level:   6.24

Vocabulary
     challenging words:    geophysicists, xenoliths, seismic, finding, tectonic, mathematical, directly, thickness, knowing, drilling, density, epicenter, mantle, volcanic, interior, outer


A CAT Scan of Earth
By Patti Hutchison
  

1     If a doctor needs to see what's wrong inside you, he doesn't have to cut a big hole in you and look in. He uses other methods such as CAT scans and X-rays. The earth's interior is too hot, and there is too much pressure for humans to explore it directly. So, like doctors, scientists rely on other methods to find out what's inside the earth.
 
2     There are many ways of finding out what the earth is like below the surface. One method is drilling. Large drills bore holes in the crust of the earth for oil and gas wells. This method only touches the surface, however. Wells have only been able to be drilled about ten kilometers below the surface. However, they do give us information about what lies at those depths.
 
3     Rarely, volcanic and tectonic actions give us clues to the interior of the earth. Erupting lava sometimes brings xenoliths. These are parts of the earth's mantle. Earthquakes sometimes expose huge pieces of mantle rock. Scientists then study these materials to know what the mantle is made of.
 
4     Scientists know the earth has a magnetic field. It is what makes compasses work. It also helps animals on their paths of migration. Scientists also know that in order to have this magnetic field, there must be a high concentration of metal inside the earth. They also know that this metal must be able to be in a liquid state at high pressures. This information gives clues as to what the core of the earth is made of.

Paragraphs 5 to 12:
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Earth
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Science
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    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  
 



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