Question

The approximate total surface area of Earth is 5.1x10^8 km2. All the salt water on Earth has an approximate surface area of 352,000,000 km2. All the freshwater on Earth has an approximate surface area of 9x10^6 km2
How much of Earth's surface is covered by water, including bolt, salt, and fresh water? Write your answer In scientific notation

Answer 1

To find the total surface area covered by water, including both saltwater and freshwater, we can simply add the surface areas of the two.

Total surface area covered by water = Surface area of saltwater + Surface area of freshwater
= 352,000,000 km² + 9x10^6 km²
= (3.52x10^8 + 9x10^6) km²
= 3.61x10^8 km²

Therefore, approximately 3.61 x 10^8 km² of Earth's surface is covered by water.

Note: "bolt" in the question seems to be a typo; assuming it is meant to be "both" instead.