Because coal and most limestones are formed from organic material (living things). Coal is formed from compressed plant material, and limestone from animal remains (hard parts: soft parts are almost always rotted, broken by force or consumed by predators). From here you get different kinds of coal, depending on how long and how deep they have been buried. Limestones vary according to their composition (through formation). 'Shelly limestone' is composed of shell, as the name suggests. Chalk is composed of coccoliths - minuscule shell of tiny sea creatures millions of years ago. These rocks are, therefore, fossils.
Coal and limestone are both sedimentary rocks that are formed from the accumulation of organic material (coal) or calcium carbonate (limestone) over millions of years. Both are used as natural resources in various industries, with coal being primarily used for energy production and limestone used in construction, agriculture, and manufacturing.
Sedimentary rocks can be formed by chemical reactions when minerals in water precipitate out and settle to form rock layers. Examples of sedimentary rocks formed by chemical reactions include limestone and halite.
Coal is a sedimentary rock that forms from the remains of plants and organic matter, while chalk is a sedimentary rock primarily composed of the calcium carbonate remains of marine organisms like plankton and shellfish.
Limestone is a type of rock that can be either chemical or organic in nature. Chemical limestone is formed through the precipitation of calcium carbonate, while organic limestone is made up of the remains of marine organisms like shells and coral.
Coal is not a rock, but rather a sedimentary organic rock that forms from plant debris. It is comprised of organic matter like carbon, hydrogen, and oxygen, making it different from inorganic rocks which are formed from non-living materials.
The material comprising the rocks coal and limestone are derived from organisms. Therefore, they are classified as organic sedimentary rocks.
sedimentary rocks can be classified by detrial, chemical ,or organic
Kaibab Limestone is not an organic sedimentary rock, but classified only as a sedimentary rock. Organic sedimentary rocks form from the remains of carbon rich plant life normally.
Examples of sedimentary rock include:BauxiteLimestoneDolostoneBrecciaConglomerateShaleMudstoneBituminous CoalSandstoneHaliteGypsumChalkCoquinaLateriteArkoseGraywackeClaystoneSiltstoneChert
Chalk is a type of limestone. Limestone and coal are both organic sedimentary rocks.
Rocks that are categorized as sedimentary rocks include sandstone, breccia shale, limestone and selenite. Sedimentary rocks are classified by their grain size.
Examples of organic sedimentary rocks include coal, which forms from the accumulation and compaction of plant remains, and limestone, which can contain organic debris such as shells and coral. Organic sedimentary rocks are derived from the remains of living organisms.
Sedimentary rocks formed from living or once-living material are called organic sedimentary rocks. Examples include limestone, coal, and chalk.
Sedimentary rocks are classified into three main types based on their formation processes: clastic, chemical, and organic. Clastic sedimentary rocks are formed from the accumulation and compaction of mineral and rock fragments, such as sandstone and shale. Chemical sedimentary rocks result from the precipitation of minerals from solution, exemplified by limestone and rock salt. Organic sedimentary rocks, like coal, form from the accumulation of plant or animal debris.
Crystalline limestone and chert are classified as biochemical sedimentary rocks. Crystalline limestone forms from the accumulation of calcite-rich remains of marine organisms, while chert forms from the silica-rich remains of marine organisms such as radiolarians or diatoms.
Sedimentary rocks formed from the remains of plants and animals are called organic sedimentary rocks. Examples include coal, formed from the remains of plants, and limestone, formed from the shells of marine organisms.
Marble, the rock, is metamorphic. From limestone.