Earth a unique planet

Earth is a very unique planet because of no other planet that we know of is close to being like it.  The earth’s mantle i nearly two thausand nine hundred km thick.  The earth’s core is the center ad most dense part of the earth. It is manly made up of iron.  There are two types of  seismic waves p waves are primary waves and they travel through liquids, solids and gases. S waves travel faster  through more-rigid materials. and are more useful to scientists exploring the earth’s interior. The magnetosphere is the source of the earth’s magnetic field may be the liquid iron in the earth’s outer core.  The law of gravitational force is if you where standing on a mountain you would weight less because you are farther away from the earth’s core. The farther away from the earthe core the less gravitational pull the earth has on you.

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