If the volume of a substance is 1 cubic meter, then what is its
volume in centiliters?

0.1CL

Explanation:

The problem entails we convert from cm³ to centiliters;

 To solve this problem:

Convert from cm³ to Liters and then Centiliters.

              1000cm³ =  1L

So            1cm³ will give  0.001L

Also;

                100CL will give 1 liter;

      1Cl  = 1 x 10⁻²L

So:

               0.01L will give 0.001 x 100  = 0.1CL

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first one is the correct answer