Concept:Bedding planes are natural division surfaces between successive layers of deposited sediment.
Explanation:Sedimentary rocks form when sediments settle in horizontal layers, or beds, over long periods.
As new material accumulates, each layer compresses the one below it, creating distinct bedding planes along the contacts.
These planes represent pauses or changes in deposition, such as different grain size or sediment type.
Igneous rocks crystallize from molten magma and usually lack such layering surfaces.
Metamorphic rocks develop foliation due to heat and pressure, not bedding planes.
Volcanic rocks cool from lava and also do not show sedimentary bedding.
Hence, bedding plane is a typical field identification feature of sedimentary rocks.
Answer:A. sedimentary rocks