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7 February, 22:00

The approximate total surface area of Earth is 5.1 * 108 km2. All the salt water on Earth has an approximate surface area of 352,000,000 km2, and all the freshwater on Earth has an approximate surface area of 9 * 106 km2. How much of Earth's surface is covered by water, including both salt and fresh water? Write your answer in scientific notation.

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  1. 8 February, 01:19
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    Earth's surface covered by water is 352,000,000 + 9 x 10^6 = 352,000,000 + 9,000,000 = 361,000,000 = 3.61 x 10^8
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