Shale
Shale
Shale Rock
Yes, coral reefs are made of the limestone skeletons of deceased corals - the living corals are on the surface of the reef.
A Sedimentary Rock. Eg, Bioclastic Limestone.
Limestone and chalk.
Coral is the hard rock-like substance that is formed by skeletons of tiny sea animals. These calcareous skeletons build up and form islands and reefs.
coral reefs were formed by the calcium of skeletons
Limestone is often sedimentary, formed of calcite in the form of shells and coral. So it's found where there used to be an ocean.
No.
Coral limestone is formed almost completely from the calcitic skeletons of individual coral polyp colonies. Other limestones can be formed from the shells of marine organisms or be formed from the precipitation of calcite from a saturated solution, or a combination of the two. Chemically, they're pretty much the same.
Coral island.
Shale rock is indirectly formed of skeletons and ancient coral animals. Clay minerals and tiny fragments of minerals like quartz and calcite make up shale. Calcite comes from the reaction of CaCO3, or calcium carbonate with Hydrogen ions. CaCO3 is a component of shells and bones.