The is a layer of liquid nickel and iron believed to be responsible for generating the earth's magnetic field.

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

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According to the earth science reference tables, during which geologic time period were the continents of north america, south america, and africa closest together?