Sedimentry Rocks
Unlike Igneous and Metamorphic rocks, Sedimentary rocks arent formed by heat. They are formed by minerals and other materials sitting in water for an extremely long time. While the minerals and other materials are in the water, they will have various things put pressure on them. After being exposed to these conditions for so long, it forms into sedimentary rock. Sedimentary rocks form layers called strata which can be seen in exposed cliffs. Examples of sedimentary rocks include limestone, sandstone, mudstone, greywacke, chalk, coal, claystone and flint.
LIMESTONE:
Limestone is a sedimentary rock that contains at least 50% calcium
carbonate. You will rarely find limestone in its pure white nature because it almost always
has some impurities. Limestones are used on roofs to prevent heat or weather roof damage. It can be
found in the shallow ends of marine water.
Limestone is a sedimentary rock that contains at least 50% calcium
carbonate. You will rarely find limestone in its pure white nature because it almost always
has some impurities. Limestones are used on roofs to prevent heat or weather roof damage. It can be
found in the shallow ends of marine water.
CHALK:
Chalk is a soft, white, fine-grained type of limestone. Chalk id composed
of the mineral calcite and is made from the fossilized skeletons of miscrscopic
marine plankon. Most of the world's chalk deposits date from the Cretaceous Period, 144 - 65
million years ago.
Chalk is a soft, white, fine-grained type of limestone. Chalk id composed
of the mineral calcite and is made from the fossilized skeletons of miscrscopic
marine plankon. Most of the world's chalk deposits date from the Cretaceous Period, 144 - 65
million years ago.