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.
Types of Energy Sources. There are two types of energy sources, Renewable and Non-Renewable sources. Renewable energy sources are sources that can be replenished or which are available naturally in excess. Non-Renewable energy sources are limited in their availability.ome of the many forms of energy are: 1  Kinetic energy. 2  Potential energy. 3  Gravitational energy. 4  Nuclear energy. 5  Chemical energy. 6  Heat energy. 7  Electrical energy. 8  Electromagnetic energy. 9  Sound energy. 10  Solar energy.