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.
One type of limestone which is very pure is called chalk, but most other limestones contain variable amounts of mud or sand or other material. Much of Ireland is composed of limestone, especially in the Dublin district and the Central Plain, and as far apart as South Donegal and Waterford.