Dairy products, while high in calcium, are low in magnesium. Green vegetables are high in magnesium. 1  A Quick and Essential Guide to Choosing Nutrient-Dense Foods For good overall health and disease prevention, a diet including a large variety of nutrient-dense foods is critical.-2 cups or 5-6 ounces of these fish, with or without bones, are enough to provide up to 300 mg of calcium. You can also buy canned salmon and enjoy a healthy meal full of nutrients.   The last of our 3 food sources of calcium is calcium fortified orange juice.
Non-renewable energy resource: an energy resource that is not replaced or is replaced only very slowly by natural processes. Primary examples of non-renewable energy resources are the fossil fuels --oil, natural gas, and coal.
Definition of Renewable Energy. There is much debate about how to define and distinguish renewable energy from non-renewable, and the terms and definitions chosen can have huge impacts on policy and regulatory efforts aiming to promote clean energy resources.enewable energy does not include energy resources derived from fossil fuels, waste products from fossil sources, or waste products from inorganic sources..