The term for the separation of the Earth into internal layers early in our planet's history is _______. 
Definitions:
School Achievement Scores
Quantitative measures assessing the academic performance of students, often reflected through grades, standardized tests, or other evaluation methods.
Overweight
A condition characterized by having more body weight than is considered healthy for a person's height, often measured by body mass index (BMI).
Number of Televisions
The total count of television sets in a given setting, often used in media studies or family dynamics analysis.
Urban Environment
An area characterized by high population density and vast human features in comparison to areas surrounding it, including cities and towns.
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