What process accounts for the layers found in Earth?
a. Plate tectonics
b. Accretion
c. Density stratification
d. Subduction
ANS: C
Heavy elements like iron and nickel pulled inward towards the core while lighter materials like oxygen
and silicon rose toward the surface. The Earth now has distinct interior layers separated by their
density. Information can be found in the section Earth, Ocean, and Atmosphere Accumulated in Layers
Sorted by Density.
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