What is the evidence that the earth’s magnetic field is not emanating from permanently magnetized material, even though it might seem that the earth has a strong bar magnet at its center?
Answer to relevant QuestionsIf earth’s magnetism is not derived from a permanently magnetized solid metallic core, what causes the magnetism?The size of the earth was probably first calculated by Eratosthenes, a Greek living in Egypt, in 250 B.C. Figure 1.7 shows the elements he used in his calculation. How could he have arrived at a circumference of about 40,000 ...If the height and the base of a triangle are doubled, what happens to the area? Explain24 + 3.1 + (-44) + (-8.2) + 634 cubed + 10 X 20 + 8 squared – 23
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