Formation of a sedimentary rock
A sedimentary rock is formed by many layers of sediment layering on top of each other at the bottom of a body of water. Eventually the bottom layer of sediment will become solid. turning it into stone.
types of sedimentary rocks
clastic sedimentary
Clastic Sedimentary rocks are composed of pre-existing rocks that have been moved by some kind of current (river, stream, etc.). To a stopping point where they layer upon each other until the lower layers harden into rock.
organic sedimentary
Organic Sedimentary rocks are made up particles from past living beings or plants. For example coal is an organic sedimentary rock.
chemical sedimentary
Chemical rocks form as materials evaporate.
sedimentary Rock features
Fossils
Fossils are the imprints of animal corpses on a rock. Typically the imprint of an ancient animal or plant. Sedimentary rocks have fossils whereas other types of rocks do not.
Bedding
Bedding consists of lines called bedding planes, which mark the boundaries of different layers of sediment
Desiccation cracks
Desiccation cracks, also referred to as mud cracks. Are formed when muddy sediment is exposed to open air and begin to dry out.
ripple Marks
Ripple marks resemble the shape of waves or ripples and are caused by waves or currents on the rocks surface
How Limestone is formed
Limestone
Limestone is an organic sedimentary rock so it was formed with the remains of dead animals that ave been compreesed by layers of sediment being piled on top of it.