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A science reading lesson on the structure of the Earth.
 

EARTH STRUCTURE

A science lesson on the structure of the earth. Includes printable teaching reading comprehension lesson worksheets.

 

Objectives:

  • Students will learn that the earth has four internal layers:  the crust, the mantle, and the inner and outer cores.
  • Students will learn that the structures of the internal layers are different.  These differences cause physical phenomena that we can observe on earth's surface.
  • Students will learn that magma is released from the earth's interior, causing volcanic eruptions on the surface.
  • Students will learn the different types of stress that rocks are subjected to.  These stresses cause changes in rock both above and below the surface.


Suggested Grades:

3rd Grade - 4th Grade - 5th Grade - 6th Grade

 




 
 
 

 

EARTH STRUCTURE LESSON

 

Directions:

Print the Earth Structure reading comprehension passage and questions (see below).

 

Students should read the passage silently, then answer the questions.  Teachers may also use the text as part of a classroom lesson plan.

 

Lesson Excerpt

     You might think the earth is just a giant ball made of rock and soil.  On the surface, that is true.  The crust is the outermost surface of the earth.  It is made of soil with a thick layer of rock underneath.  Most of the rocks that make up the crust are made of the elements silicon and oxygen.  Smaller amounts of aluminum, iron, calcium, and other elements make up the rest.  The crust is thicker beneath the continents and thinner under the oceans.  The thickness of the crust varies from five to ten kilometers thick under the oceans, to between twenty and seventy kilometers thick beneath the continents.  Underneath the rocky crust, the earth is very different.
    
     Underneath the crust lies the earth's mantle.  This layer of the earth is about 2,900 kilometers thick.  High temperatures (2800 – 3200 degrees Celsius) melt the rocks of the mantle, forming a substance called magma.  This thick, gooey layer has a texture like thick oatmeal.  When magma reaches earth's surface, like when a volcano erupts, it is called lava.

Continued...

 

LESSON PRINTABLES

Earth Structure

Print this science worksheet for this lesson.

 Includes reading passage, questions, and answer sheet.

 

 

 

 

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