GEOLOGY

Detailed explanation-1: -Fossiliferous limestone and coal are two examples of organically-formed sedimentary rocks.

Detailed explanation-2: -An important organic sedimentary rock is coal. Most coal forms in swampy land adjacent to rivers and within deltas, and where climates are humid and tropical to temperate.

Detailed explanation-3: -Examples are limestones formed from shell or skeletal remains, coquina (a sedimentary rock made of shell fragments), diatomite (a sedimentary rock made of the remains of diatoms), and coal.

Detailed explanation-4: -Coals are the most abundant organic-rich sedimentary rock. They consist of undecayed organic matter that either accumulated in place or was transported from elsewhere to the depositional site. The most important organic component in coal is humus.

Detailed explanation-5: -Coal is a sedimentary rock. Coal is altered through biological and burial-thermal processes into different ranks. Many sedimentary rocks are also altered through burial-thermal processes (increasing cementation, etc.).