The earth means surface and the interior is domain of geology. The earth is divided into four main layers. The earth interior system formed 4.54 billon years ago. It discovered by recording of seismic waves from earthquakes. The earthquakes gave the first clue.
- Inner core
# Its is a primarily solid ball with a radius of about 1220 kilometers or 760 miles.
- Outer core
#Its liquid layer about 2,300 km thick composed of iron.
- Mantle
#The mantle is more than two thousand miles think and accounts for more than three quarters of the volume.
- Crust
#Its a hard outer layer that outermost solid shell of a rocky planet.
The core is calm mostly of iron (Fe), the most hot outer core is mentle. The earth ,ass is in the mantle, which is composed by iron (Fe), magnesium (Mg), aluminum(Al), silicon (Si), Oxygen (O). The earth interior is a part of seismic waves,. The temperature in the core is hotter than the sun surface. This intense heat from the inner core cause material in the outer core and mantle to move around. This movement cause a large plate made of crust and upper mantle to move slowly over the earth’s surface.
Source
"The Interior of the Earth." The Interior of the Earth. N.p., n.d. Web. 15 Apr. 2015. <http://pubs.usgs.gov/gip/interior/>.
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