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3. Theextends up to about 1000 km above the surface of the earth. |
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Answer» The ALTITUDE of the lower BOUNDARY of the exosphere varies. When the Sun is active AROUND the peak of the sunspot cycle, X-rays and ULTRAVIOLET radiation from the Sun heat and "puff up" the thermosphere - RAISING the altitude of the thermopause to heights around 1,000 km (620 miles) above Earth's surface. Explanation: |
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