Earth’s internal structure

21.	What is the most important source of information regarding the internal structure of the earth?
	A. unnatural means
	B. seismology
	C. volcanic action
	D. plate tectonics Option “B” is correct.

22.	By whom has the division of geology been done in the form of Sial Seema and Nife?
	A. by van der Graat
	B. by deli
	C. by Holmes
	D. by swess Option “D” is correct.

23.	What will be the correct order of the following from the surface of the earth towards the centre? I. Limit II. Sial III. nife
	A. I, II, III
	B. II, I, III
	C. I, III, II
	D. III, II, I Option “B” is correct.

24.	Which of the following statement is true?
	A. Sial is dominated by rocks like granite and gneiss.
	B. The border is mainly made of rocks like basalt and grabro?
	C. The core is rich in elements like nickel and iron.
	D. all of the above Option “D” is correct.

25.	In which layer of the Earth’s crust is there a majority of basalt rocks?
	A. Sial
	B. range
	C. nife
	D. not in any Option “B” is correct.

26.	In which part of the earth is there predominance of nickel and iron?
	A. Sial
	B. range
	C. nife
	D. not in any Option “C” is correct.

27.	Who first used the word ‘SiAl’ for the uppermost layer of the earth?
	A. Holmes
	B. Sweas
	C. Jefferies
	D. deli Option “B” is correct.

28.	What is the name of the layer farthest from the top of the three concentric layers of the earth?
	A. Sial
	B. range
	C. nife
	D. none of these Option “B” is correct.

29.	The magnetic substance found in the center of the earth is –
	A. Granite
	B. basalt
	C. nickel
	D. diorite Option “C” is correct.

30.	Swes had divided the interior of the earth into three regions. Not in their division –
	A. Sial
	B. range
	C. nife
	D. substrate Option “D” is correct.

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