New Layer in Earth’s Core

 Crust :-

• The outermost layer of the earth .
• There are two types of crust, each with unique physical and chemical characteristics:
  • Continental crust; 
  • Oceanic crust.
• Silica (Si) and Aluminium (Al) are the two main components of the crust, which is why it is Commonly referred to as SIAL

Mantle:- 

• The area of the interior that is beyond the crust.
• It is primarily composed of silicon and magnesium, the mantle is also known as SIMA.
• The density of the layer, which ranges from 3.3 to 5.4g/cm3, is greater than that of the crust.
• The entire crust and the topmost solid portion of the mantle comprise the Lithosphere.

Core:

• Layer that surrounds the earth’s core that is the deepest
• It is also called NIFE since it contains nickel (Ni) and iron X (Fe).
• The inner core and the outer core are the sub-layers that make up the Core. 
• The inner core is solid, but the outside core is liquid (or semi-liquid)

Seismic Discontinuities

 New Fifth Layer  

Innermost core :- 

• Seismic waves generated by earthquakes have revealed new insights about the deepest parts of Earth’s inner core.
• It is also called NIFE since it contains nickel (Ni) and iron (Fe).
• This layer is a solid ‘metallic ball’ that sits within the center of the inner core.

Practice Questions for Prelims

Consider the following statements:

1. The discontinuity between the Upper and lower crust is termed the Conrad Discontinuity.
2. The discontinuity between the crust and mantle is called the Mohorovich Discontinuity or Moho discontinuity.

Which of the above statement(s) is/are correct?
a) Only 1
b) Only 2
c) Both 1 and 2
d) Neither 1 nor 2

Ans. c)

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