1. 1.2 to 5.0
  2. 2.4 to 5.0
  3. 2.1 to 3.0
  4. 2.8 to 3.0
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Answer: Option 4

The average density of the upper crust is 2.8 and that of the lower crust is 3.0. This difference in density is believed to be due to the pressure.

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