3. The core that Richard Oldem had discovered turned out to be the Earth's
I

The first layer is the crust, a skin of rock covering the planet. The core that Lehman had found was the Earth's inner core. The core that Richard Oldem had discovered turned out to be the Earth's outer core.

Explanation:

answer; the above answer to the above statement is (true)

sorry, but you do not have posted the diagram.