Question

1. The approximate total surface area of Earth is 5.1 x 10^8 k^2. All the salt water on Earth has an approximate surface area of 352,000,000 km^2, and all the freshwater on Earth has an approximate surface area of 9x10^6 km^2. Hownmuch of Earth's surface is covered by water, including both salt and fresh water?Write your answer in scientific notation.

2. How much of Earth's surface is covered by land? Write your answer inscientific notation.

Answer 1

Approximately 3.61 x 10^8 km² of the Earth's surface is covered by water, including both saltwater and freshwater.

Step-by-step explanation:

About 71% of the Earth's surface is covered by water. This includes both saltwater and freshwater. The total surface area of the Earth is approximately 5.1 x 10^8 km². The surface area of saltwater is estimated to be 352,000,000 km², and the surface area of freshwater is approximately 9 x 10^6 km². To calculate the total surface area covered by water, we can add the surface areas of saltwater and freshwater together:

Total water surface area = surface area of saltwater + surface area of freshwater = 352,000,000 km² + 9 x 10^6 km² = 3.61 x 10^8 km² (approximately)

Therefore, approximately 3.61 x 10^8 km² of the Earth's surface is covered by water, including both saltwater and freshwater.