What grey rock that has crinoids and brachiopods reacts to hydrochloric acid?

The rock is limestone, I hope this helps!!

Hey there Barney456,

What grey rock that has Crinoids and Brachiopods reacts to Hydrochloric acid?

Limestone. It is found underwater. When marine organisms die their skeletons compact and form the limestone

Hope this helps :D

~Danielle♥

Ibelieve your answer is true 

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