On a scale from 1 to 8 where 1 is the smallest planet, which number represents Mercury's size?

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Multiple Choice

On a scale from 1 to 8 where 1 is the smallest planet, which number represents Mercury's size?

Explanation:
The key idea is ranking planets by size from smallest to largest. Mercury is the smallest planet by diameter, so it takes the first position on that scale. Its diameter is about 4,879 kilometers, smaller than every other planet, which is why it sits at the very start. On a scale like this, larger planets would appear at later positions, so Mercury’s placement at the first spot is the best match for being the smallest.

The key idea is ranking planets by size from smallest to largest. Mercury is the smallest planet by diameter, so it takes the first position on that scale. Its diameter is about 4,879 kilometers, smaller than every other planet, which is why it sits at the very start. On a scale like this, larger planets would appear at later positions, so Mercury’s placement at the first spot is the best match for being the smallest.

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