Using the procedure in Example 10.1, derive a general formula for the cooling time of a planetary body of given internal and surface temperatures and a rocky crust of thickness = l. How would this cooling time be affected if the crust gradually formed, so that it was thinner in the past and thickened as the planet cooled down?

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The Answer of Using the procedure in Example 10.1, derive a general formula for the cooling time of a planetary body of given internal and surface temperatures and a rocky crust of thickness = l. How would this cooling time be affected if the crust gradually formed, so that it was thinner in the past and thickened as the planet cooled down?

Using the Procedure in Example 10