Question

________ are formed from skeletal remains of coral and other lime-secreting sea animals.

1) Limestones
2) Schists
3) Marbles
4) Sandstones
5) Shales

Answer 1

Limestones are formed from skeletal remains of coral and other lime-secreting sea animals. When a saturated solution of CaCO3 in CO2-rich water rises toward Earth's surface or is otherwise heated, CO₂ gas is released as the water warms and CaCO3 precipitates from the solution.

Step-by-step explanation:

Limestones are formed from skeletal remains of coral and other lime-secreting sea animals. Limestone deposits that form caves consist primarily of CaCO3 from the remains of living creatures such as clams and corals. When a saturated solution of CaCO3 in CO2-rich water rises toward Earth's surface or is otherwise heated, CO₂ gas is released as the water warms and CaCO3 precipitates from the solution.