Question

A single grain of sand occupies a volume of about 0.004 cubic millimeters. Based on your previous answer,

how many grains of sand are on Earth's beaches?

Answer 1

Answer:

2 & 23

Explanation:

Calculate the number of grains in two steps.

First, calculate the volume of one grain of sand in cubic meters:

0.0044 mm3 ×  = .

Then, calculate the number of grains of sand on the beaches:

7 × 1011 m3 ×  = 2 × 1023 grains.

Answer 2

Answer:

2*10^23 grains of sand on the earths beaches.

Explanation:

calculate the number of grains in two steps.

step 1: calculate the volume of one grain of sand in cubic meters: 0.0044m^3 * 1m^3/ 1 * 10^9mm^3 = 4 * 10^-12 m^3/ 1 grain.

step 2: calculate the number of grains of sand on the beaches: 7 * 10^11 m^3 * 1grain/ 4 * 10^-12 m^3 = 2 * 10^23 grains of sand on the beaches.