SPOTLIGHT FIGURE 3.28 Patternș of paleomagnetism and their explanatioň by plate tectonic theory. a When scientists conducted a magnetic survey of a spreading center, the Mid-Atlantic Ridge, they found bands of weaker and stronger magnetic fields locked in the rocks. b-d The molten rocks forming at the spreading center take on the polarity of the planet when they are cooling and then move slowly in both directions from the center. When Earth's mag- netic field reverses, the polarity of newly formed rocks changes, creating symmetrical bands of opposite polarity. normal polarity reversed polarity d Period of normal magnetism b Period of normal magnetism C Period of reverse magnetism New bands of oceanic crust alternate in polarity as they are formed. Normal polarity Reversed polarity Normal polarity Gary Hincks/National Geographic

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