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With reference to the interior of the earth consider the following statements. 
1. The P-waves are similar to sound waves. They can travel through only solid materials. 
2. The mean thickness of continental crust is around 30 km. 
3. The surface waves are the last to report on seismograph. 
Which of the statements given above is/are correct?

[SSC JE CE 2016 Set 2 (Non Technical0]
A
B
C
D