How does the ocean floor preserve evidence of past magnetic reversals.

(A) The ocean floor is uniformly old, preserving the Earth's 4.6 billion history.

(B) Isotopic analysis of ocean core sediments help determine sea floor age and this can be used to infer past magnetism.

(C) Magnetic particles in basalt orient with the magnetic field in force at the Curie Point.

(D) Mantle hot spots are always oriented to the magnetic field.

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.