The process of differentiation of the Earth into discrete layers is thought to have been completed by
A)4.54 Ma.
B)13.7 Ga.
C)13.8 Ma.
D)4.54 Ga.

Question

Quizplus · Accepted Answer

The differentiation of the Earth into discrete layers began shortly after its formation, about 4.54 billion years ago (Ga). It is thought to have been completed within the first few hundred million years of the Earth's history. Therefore, option D is the correct answer. Option A (4.54 Ma) refers to a time period of 4.54 million years ago, which is much too recent. Option B (13.7 Ga) refers to the age of the universe, not the Earth. Option C (13.8 Ma) refers to a time period of 13.8 million years ago, which is much too recent.

The Process of Differentiation of the Earth into Discrete Layers