Place the numbers in descending order. 2.3x10 to the power of -10; 3.2x10 to the power of -10; 2.3x10 to the power of -12; 2.3x10 to the power of -8

Descending order:

3.2x10^-10
2.3x10^-10
2.3x10^-12
2.3x10^-8