There is three times as much water as land on Earth's surface. What percent of earth is covered by water?
http://www.epa.gov/gmpo/edresources/water_5.html
http://en.wikipedia.org/wiki/Earth
To determine the percentage of Earth's surface covered by water, follow these steps:
Step 1: Find the total surface area of Earth.
The surface area of a sphere is given by the formula A = 4πr^2, where A is the surface area and r is the radius. The average radius of Earth is approximately 6,371 kilometers (or 3,959 miles). Using this radius value, you can calculate the surface area.
Step 2: Calculate the area of land on Earth's surface.
Given that there is three times as much water as land, this means that the ratio of water to land is 3:1. Since we need to find the land area, we can consider the total area as 4 parts, with 3 parts being water and 1 part being land. Therefore, the land area is one out of four parts.
Step 3: Calculate the percentage of Earth's surface covered by water.
Now that we know the land area is one out of four parts, we can calculate the percentage. Divide the land area by the total area and multiply by 100 to get the percentage.
Here's the calculation:
Total surface area of Earth = 4πr^2
= 4 * π * (6,371 km)^2
Land area = Total area / 4
Percentage of Earth covered by water = (Water area / Total area) * 100
By following these steps and performing the calculations, you can determine the percentage of Earth's surface covered by water.