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.
Chalk is a member of the limestone family of rocks, that is they contain a large amount of calcium carbonate which means that the rock is alkaline, that is the opposite of acid. Chalk is a special form of limestone, which is composed almost entirely of calcium carbonate, which is why it is white in colour.