In the structure of the planet Earth, the core under the mantle is made up of which one of the following?

In the structure of the planet Earth, the core under the mantle is mad

1.	In the structure of the planet Earth, the core under the mantle is made up of which one of the following?
A.	iron
B.	Aluminum
C.	potassium
D.	Chromium
Answer» B. Aluminum