The Earth's magnetic field is due to ____.

a. the presence of magnetic iron and nickel in the core
b. gravity
c. the occurrence of magnetite in all rocks
d. convection in the liquid outer core
e. none of these


d. convection in the liquid outer core

Environmental & Atmospheric Sciences

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Answer the following statement true (T) or false (F)

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Which stage of a thunderstorm is associated with the coexistence of updrafts and downdrafts?

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