Question

Q. Consider the following statements with reference to structure of earth:

Which of the above statements is/are correct?

• A.
  1 only
• B.
  2 only
• C.
  1 and 3 only
• D.
  2 and 3 only

Answer 1

The correct option is A

1 only
Explanation:

Statement 1 is correct: The interior is the core and is made of mainly iron, with some nickel and is called nife.

Statement 2 is incorrect: The lower lithosphere consists of denser basaltic rocks and comprises mainly silica,iron and magnesium.

Statement 3 is incorrect: When the melting point of the iron was reached, droplets of liquid iron, one of Earth's most abundant elements (about 35% overall) flowed (slowly at first) toward the planet's interior under the pull of gravity.
Compounds of lighter elements rich in silicon (Si), oxygen (O), and other light elements that were also molten (i.e., Al, Na, Ca, K) were displaced toward the surface