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1. ____- hard and rigid, the Earth's outermost and _____ layer. Only a few miles (5 km) thick under the oceans and averaging 20 miles thick under the continents.
2. ________- Divided into two sub regions, upper and lower, this dense layer made of hot semi rock is located directly below ____ and is about 1800 miles thick.
3. ______ ____- The only _____ layer of the Earth- a sea of mostly iron and nickel. It is roughly 1800- 3200 miles below the surface and about 1400 miles thick. Temparatures reach ____°C.
4. _______ _____- An extremely hot, solid sphere of mostly _____ and ______ at the center of the Earth. It is 3200 to 3960 miles below the surface and about 750 miles in diameter.
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