The approximate total surface area of Earth is 5.1×108

Question

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 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

To find the total surface area covered by water, we need to add the surface area of salt water and freshwater.

Surface area covered by water = surface area of salt water + surface area of freshwater
= 352,000,000 km^2 + 9x10^6 km^2

Adding these two values gives us:

= 352,000,000 + 9x10^6 km^2

Now, we can write this value in scientific notation. Since the given values are already in scientific notation, we can simply add them:

= 352,000,000 + 9x10^6 km^2
= 3.52x10^8 + 9x10^6 km^2

Therefore, the total surface area covered by water, including both salt and fresh water, is approximately 3.52x10^8 + 9x10^6 km^2.