| (1) The average density of the outer crust is 2.8. |
| (2) The crust is separated from the mantle by the Gutenberg discontinuity. |
| (3) There is sudden increase in the velocity of P waves along the mantle core boundary. |
| (4) The inner core of the earth is in molten state. |
A) 1 and 2
B) 2 and 3
C) 1 and 3
D) 3 and 4
Correct Answer: C
Solution :
The Earth is formed of three concentric layers; the core, the mantle and the crust: these are separated by transition zones called discontinuities. The Earth's inner core is the Earth's innermost part and according to seismological studies, it has been believed to be primarily a solid ball with a radius of about 1.220 kilometres (760 miles), which is about 70% of the Moon's radius. Moho discontinuity is the boundary between the Earth's crust and Mantle.
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