Worksheets and No Prep Teaching Resources
Worksheets and No Prep Teaching Resources
Reading Comprehension Worksheets
Rocks and Minerals
Marking Time Geologically

Rocks and Minerals
Rocks and Minerals


Marking Time Geologically
Print Marking Time Geologically Reading Comprehension with Sixth Grade Work

Print Marking Time Geologically Reading Comprehension


Reading Level
     edHelper's suggested reading level:   high interest, readability grades 6 to 8
     Flesch-Kincaid grade level:   6.16

Vocabulary
     challenging words:    eons, macrofossils, multi-celled, tectonic, further, absolute, billion, atmosphere, geologic, principle, asteroid, geologists, mass, volcanic, division, based
     content words:    Hadean Eon, Archaen Eon, Proterozoic Era, Phanerozoic Eon


Marking Time Geologically
By Patti Hutchison
  

1     Rocks can tell us amazing stories about the history of the earth. Over millions of years, the earth has undergone many changes. There have been volcanic eruptions, tectonic collisions, and ice ages. Many species of plants and animals have come and gone. By studying fossils and rock layers, scientists have put together a kind of photo album of earth's history.
 
2     Geologists have divided the history of the earth into units of time. They call it the geologic time scale. This record of time begins 4.6 billion years ago when the earth was formed. It continues until present day. These time units are based on the fossils that are contained in the layers of rock. This is sometimes called the fossil record. The units are also based on major events that took place such as asteroid impacts or mass extinctions.
 
3     Imagine the geological time scale as a vertical time line. The oldest division of time is at the bottom. As you move upward, each division is younger. This relates to the younger layers of rock.
 
4     Some scientists believe that sediments have been laid down in order. Each layer represents a slice of time. This is called the principle of superposition. This principle is sometimes difficult to apply when studying the rock layers. This is because the rocks have been disturbed by erosion and tectonic forces. However, scientists have found enough evidence to put together the time scale.

Paragraphs 5 to 11:
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Rocks and Minerals
             Rocks and Minerals


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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  
 
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    Weather  
 



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