SEDIMENTARY ROCK
'(<a href="http://www.j-archive.com/media/2004-07-22_J_29.wmv">Cheryl of the Clue Crew dissolves a piece of rock in a chemistry experiment.</a>)  With diluted hydrochloric acid, you can test for this rock; the acid reacts with the calcite to form CO<sub>2</sub>'
limestone