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I'm having trouble with Q4c about the earth 4 Assuming that the earth is a sphere of radius 6400km,find (correct to 2 sig. figs.) a..... b...... c. the area of the earth's surface covered by water if 70% of the earth is covered by water.

thanks I've realised where i went wrong it makes sense now i thought that the inner and outer radius where separate from each other and so it confused me but its all cleared up now :) Q5 is also sorted out thanks to the person below :)

So i dont understand Q4 primarily because of no diagram and Q5 is confusing Q4. Calculate the volume of a spherical shell that has an inner radius of 5cm and an outer radius of 6cm. Give the answer in terms of pi π . Q5 a. A sphere has a volume of 2000cm^3. Calculate its radius correct...