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7th Grade Core
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The previous page helped explain that the earth is made of layers. Solid layers include the crust, mantle, and core. Above the solid crust we find water and the atmosphere.

Using your mouse drag the density numbers below to the corresponding layers of the earth on the right. Check your answer, if it is wrong, reset and try again.


Choose the Earth layer that corresponds with each of the following densities. Drag to select your answer. Make sure you check your answers when you finish.

1. 27 - 3.0

Highlight the box below to check your answers.

1. Crust
2. Mantle
3. Atmosphere
4. Inner Core
5. Outer Core
6. Ocean

3.3 - 5.7
12.7 - 13
9.0 - 12.0



  1. How do the densities of the layers of the earth determine their order?
  2. In the atmosphere, temperature varies dramatically within each layer, as well as between them.
  3. Why would it be more difficult to determine density of the atmosphere?

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Teachers should view the Teacher Site Map to relate Sci-ber text and the USOE 7th grade science core.

Updated October 24, 2008 by: Glen Westbroek

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