The Earth

    Unless you're an alien like Marty our friendly Martian, the Earth is probably your home.  The Earth is the third planet from the sun, and the fifth largest in our solar system.  It is also perhaps the most unique planet in the solar system, because it is the only one that supports life as we know it in 2000. The Earth is also the only planet that can support water in liquid form on its surface.   In fact, 71% of our planet's surface is covered by water.  The other 29% is covered by everything from mountain ranges, rainforests, and sandy deserts.  Our planet is made up of several layers, from the crust to the upper and lower mantles, to the inner core.  The inner core, at the center of the earth, is actually hotter than the surface of the sun.  Which is pretty hot.  The Earth has a modest magnetic field as compared to the other planets.

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