earth

earth is the only planet that isn't named from a roman or Greek mythology name . it was not until the twentieth century that we had maps of the whole earth. the earth is split into a bunch of different layers. they are -the crust
-the upper mantle
-the transition region
-the lower mantle
-the d'' layer
-the outer core
-and the inner core
the earth is the most dens of the planets. 71% of the earths surface is water.