Earth's Magnetosphere: Protecting Our Planet from Harmful Space Energy – Climate Change: Vital Signs of the Planet
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Earth's core may have hardened just in time to save planet's magnetic field | Science News for Students
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Evidence That Early Magnetic Field Around Earth Was Even Stronger Than Scientists Previously Believed
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Earth's Magnetic Field Why does Earth have a global or world- wide magnetic field, while other similar planets either have no magnetic fields or very different. - ppt download
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