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What is the observed feature that suggests that Mercury's iron core is molten?
Inches
A unit of length in the imperial and US customary systems, equivalent to 1/12 of a foot.
Perimeter
The total distance around the edge of a two-dimensional shape, calculated by adding together the lengths of all the sides.
Length
The measurement of something from end to end or along its longest side.
Width
The measurement or extent of something from side to side; the lesser of two or the least of three dimensions of a body.
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