9-1 The Sunâs energy is generated by thermonuclear reactions in its core
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9-2 Energy slowly moves outward from the solar interior through several processes
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9-3 The Sunâs outer layers are the photosphere, chromosphere, and corona
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9-4 Sunspots are low-temperature regions in the photosphere
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9-5 The Sunâs magnetic field also produces other forms of solar activity and causes aurorae on Earth
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