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Did u know that our planet, Earth wasn’t always thought of as a planet? Until the sixteenth century when Capernicus figured out that the Earth was another planet, which revolved around the sun, Greek astronomers thought the Earth was the center of the solar system. Also Earth is the only planet that its name didn’t come from Greek/Roman mythology.
When earth was first discovered, astronomers were only able to study it with out spacecraft. It was not until the twentieth century that we had maps of the entire planet. Pictures taken of the planet are very important, not only because they aid in weather predictions, but they are also very beautiful.
The Earth is divided into seven layers: the crust, upper mantle, transition region, lower mantle, D” layer, outer core, and inner core. “The crust varies considerably in thickness; it is thinner under the oceans, and thicker under the continents”. (Arnett1) The inner core and crust are solid, and the outer core and mantel layers......

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