- #1
Lemniscate
- 16
- 0
Homework Statement
Simple question, but I don't know how to correctly approach it.
How many drops of water are in all the oceans on earth? Assume that 1cm^3 contains 25 drops of water.
Homework Equations
The average depth of the ocean is 4 km. I know I will have to convert to cm.
Radius of Earth: 6400 km
About 70% of the Earth is covered by oceans.
The Attempt at a Solution
Need help setting up the problem correctly.
I've tried various things. I'm not sure if I have to use the surface area of a sphere or the volume of a sphere.
I have to subtract the depth of the oceans (4km) from 6400km...?