❖ The recent studies revealed that, the Earth’s inner core began to slow down its rotation since 2010, compared to the planet's surface.

❖ The slowing down could change the length of one day on the Earth by fractions of a second.

❖ The Earth's inner core, a solid sphere made of iron and nickel, is suspended within the liquid outer core (made of molten metals) and anchored in its place by gravity.