Water and Heat Riddle

Puzzle of the Day 2126 : Water and Heat Riddle
5 second puzzle – Presence of mind

Puzzle 2126 thinkwitty.com - Water and Heat Riddle

Looks like water, but it’s heat.
Sits on sand, lays on concrete.
People have been known,
To follow it everywhere.
But it gets them no place,
And all they can do is stare.

What is it?

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