Question

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.

Answer 1

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