There's two main reasons why geologists think that the Earth's core is made out of iron:
1. The seismic waves that travel through the core are moving at a velocity that depends on the properties of the material the waves travel through, and the best fit in this case is the Iron (Fe).
2. The iron is the most abundant metal in the universe.
The river that lies between The USA and Mexico is the Rio Grande
Hey there,
The Sea Of Japan(East sea) separates the Korean Peninsula from the rest of Asia.
Hope this helps ^_^
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Answer: B) They are Easily carried by the wind