1 Apply Aloe vera gel or juice: Aloe vera gel or juice helps get rid of acne scars and makes your facial skin healthier. 2  There are many brands of aloe vera gel or juice available on the market today.
Jupiterimages/Photos.com/Getty Images. Limestones are a class of sedimentary rocks composed of the same mineral, calcite, which is made from calcium carbonate, or CaCO3. Despite this similarity in composition, however, not all limestone rocks are the same. Chalk is actually a special form of limestone that exhibits some differences from other rocks in the same class.
The chalk used in classrooms around the world is a type of sedimentary rock. Limestone is a sedimen â¦ tary rock that is used in concrete, building stones, antacids, soil conditioner, and steel making. Coal is another sedimentary rock which is used to produce heat and electricity. Shale is used to make brick. Sandstone and limestone are used as building stone and in the production of glass. 2  Limestone is also used for hard core in roads, and is cooked to make cement. 3  Shale is mixed with sand and used to make bricks.