Riddle

I am named for my fleeting motion. Numbered zero and four score more. A barren desert and a heavy ocean. One is flowing, the other a solid core. Who are we?

Choose an answer

A.Venus and lead
B.Mars and iron
C.Pluto and silver
D.Mercury and mercury.
Hint: It's a 3-word phrase with 17 letters, starting with "M".

Answer

Mercury and mercury.

Why this is the answer

The planet Mercury (atomic number 80, named for the swift god) and the liquid metal mercury share a name; one is a barren world, the other a heavy flowing liquid.

This riddle is filed under Planet Riddles and rated Hard.

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