They came to the conclusion that the outer core must be liquid because S waves do not pass through it, but P waves do. By observing many seismic waves from earthquakes, the scientists have been able to measure the density of many parts of the earth (i.e. core, crust, and mantle)
You hire people from another country vice versa
I believe it is c. Portugal ☺️
There are many things that made him a great leader , he involved himself into many battles, fighting for the independence of his country VenezueA!!!!!