20. Which one of the following is the inner most layer of the earth
a)Crust
b)NIFE (core)
c) Mantle
Transport
Answers
Answer: Option B - Core
Explanation:
Earth Core: The innermost layer of the earth is known as the core. It is divided into the inner core and the outer core. It comprises a high concentration of nickel and iron.
The outer core: The outer core, surrounding the inner core, lies between 2900 km and 5100 km below the earth’s surface. The outer core is composed of iron mixed with nickel (nife) and trace amounts of lighter elements.
The Inner Core: The inner core extends from the center of the earth to 5100 km below the earth’s surface. The inner core is generally believed to be composed primarily of iron (80%) and some nickel (nife). Since this layer can transmit shear waves (transverse seismic waves), it is solid. (When P-waves strike the outer core inner core boundary, they give rise to S-waves)