To order the planets from smallest to largest diameter based on the given information:
- Mercury - 4.87 x 10^3 kilometers
- Mars - 6.79 x 10^3 kilometers
- Venus - 1.21 x 10^4 kilometers
- Earth - 1.28 x 10^4 kilometers
In the response areas, you should enter:
- Response area 1: Mercury
- Response area 2: Mars
- Response area 3: Venus
- Response area 4: Earth