1) seventy percent of the Earth's surface is covered with water. find the approximate surface area of the earth that is water
2) find the volume of the earth

radius is 3963mi

Question

1) seventy percent of the Earth's surface is covered with water. find the approximate surface area of the earth that is water
2) find the volume of the earth

radius is 3963mi

anonymous · Answer

You can easily find formulas for surface area and volume of a sphere on Wikipedia. That should help you.

anonymous · Answer

i tried and it didnt help

anonymous · Answer

Assuming that Earth is spherical... What's the formula for volume then? Can you find and type it here?

anonymous · Answer

sphere = (4/3) pi r 3

anonymous · Answer

Right. $$4 \div 3 * \Pi * r^{3}$$

What does 'r' in this formula stand for?

anonymous · Answer

radius=3963

anonymous · Answer

Can you do the math then? You have all the numbers! Just divide/multiply and you'll get the answer to (2).

anonymous · Answer

v=28012.86

anonymous · Answer

Too little. Don't forget that: $$r^{3} = r* r * r$$

anonymous · Answer

62 240 377 347

anonymous · Answer

2.60712493 × 1011

anonymous · Answer

v=2 635.8033

anonymous · Answer

The number I'm getting is roughly 260,704,193,914 cubic miles or $$2.60 x 10^{11}$$ cubic miles.

anonymous · Answer

(cubic because you multiplied a number of  miles by a number of miles by a number of miles :))

anonymous · Answer

Now off to the first question. You'll have to calculate the area in a similar fashion, then calculate the percentage of it that is water.

anonymous · Answer

approximately 197,359,487mi

anonymous · Answer

Square miles. The number is correct. Well done. :)

anonymous · Answer

thank you