Estimate number of grains of sand in Sarah Desert?  TOPIC_SOLVED

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Estimate number of grains of sand in Sarah Desert?

Postby chenelle00 on Fri Oct 02, 2009 7:58 pm

The Sarhara Desert covers about 8.3 x 10^13 square feet.
The average depth of the sand in the Sahara Desert is 200ft
A grain of sand has a volume of approximately 1.3 x 10^-9 cubic feet.

I'm told the correct answer is 10^25 but I don't know how to get that answer.
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Postby stapel_eliz on Fri Oct 02, 2009 8:21 pm

You are given an area and a depth for the area of sand. Use these to find the volume of sand.

You are given a volume per grain, and have just computed the volume of sand. Divide to find the number of grains. :wink:
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