What is the average density of crust?

Average density of crust is 2.7g/cm^3.

Which political and military leader inspired a number of Napoleon’s military actions?

Which political and military leader inspired a number of Napoleon’s military actions?
A. Peter the Great 
B. Alexander the Great 
C. Chinggis Khan

Question Asked By : SANKALPA PAL 

What is discussed in Galileo's 1606 book ( Galileo's 1606 publication) : Le operazioni del compasso geometrico

Galileo's book :"Le operazioni del compasso geometrico" which was published in 1606 . (En :
Operations of the Geometric and Military Compass)

Question Asked By : SANKALPA PAL

Which of the following is discussed in Galileo.s 1606 publication, Operations of the Geometric and Military Compass? A. How to calibrate guns made of different materials B. How to deploy armies with unequal fronts and flanks C. How to construct guns