Natural earthquakes produce seismic signals which penetrate the Earth. Timing the arrival of these waves at various sites round the world, gives indication of the shape and the wave velocity in the...
The Earth has four layers. First is the crust, it is made up of 46% oxygen, 28% silicon, 8% aluminum, 6% iron, 4% magnesium, 2.4% calcium and 5.6% of other chemicals. The Mantle is composed of 44%...
its made of a mantle, inner core, outter core and crust.......and a magnetic field. The interior is made up of the
crust lithosphere (part of crust & upper mantle) upper mantle asthenosphere...