Explanation:

Recently, Researchers have revised estimate of the age of Earth’s solid inner core to 1-1.3 billion years from 565 million years old.

• The estimates for core age have fluctuated between very young and relatively high. A new research has reported that the inner core is about 1-1.3 billion years old. It is young compared to the age of Earth i.e. 4.5-billion years old.
• The structure of the earth is divided into four major components: the crust, the mantle, the outer core, and the inner core.
• Crust is the outermost part of the earth and it is brittle in nature.
• Core is separated from the Mantle by Gutenberg’s discontinuity.
• Earth’s inner core is solid and it is made of iron. Its temperature is about 6,000 degrees Celsius.
• The discontinuity between the crust and the mantle is called as the Mohorovich Discontinuity or Moho discontinuity.

Hence all statements are correct.