Riddle

Glittering points that downward thrust. Sparkling spears that do not rust. What is it?

Choose an answer

A.A stalactite
B.A dagger
C.Frost
D.An icicle
Hint: It's a 2-word phrase with 8 letters, starting with "A".

Answer

An icicle

Why this is the answer

An icicle forms as dripping water freezes into a sharp downward-pointing spike of ice, which can't rust because it isn't metal.

This riddle is filed under "What Am I?" Riddles and rated Easy.