There are two ways to remove coal from the ground: surface mining and underground mining. Surface mining is used when a coal seam is relatively close to the surface, usually within 200 feet. The first step in surface mining is to remove and store the soil and rock covering the coal (called the overburden).
Pearl oysters are not closely related to true oysters, being members of a distinct family, the feathered oysters (Pteriidae). Both cultured pearls and natural pearls can be extracted from pearl oysters, though other molluscs, such as the freshwater mussels, also yield pearls of commercial value.
Pacific Oysters are naturally one of the most nutritionally well balanced of foods. They are low in fat, calories and cholesterol in addition to being high in protein, iron, omega 3 fatty acids, calcium, zinc and vitamin C. serving of oysters contains more Zinc than any other food per serving (76.7mg in 6 medium oysters!). This is more than 100% of the suggested daily amount of 8-11mg. Zinc helps maintain a healthy immune system which is needed for fighting illness and healing wounds. It also helps maintain your sense of taste and smell.