Convection is of two types: natural and forced. Heated air rising is an example of natural convection. Hot air has a lower density than that of the cooler air in the atmosphere above it and therefore is buoyant; as it rises, however, it loses energy and cools.
Your best good carbs sources are from this healthy carbohydrates list: 1  Raw and lightly steamed vegetables, 2  Legumes, beans, nuts and seeds, 3  High fiber 100% whole grains,4  Raw, whole, fresh fruits, 5  Most low fat dairy.our best good carbs sources are from this healthy carbohydrates list: 1  Raw and lightly steamed vegetables, 2  Legumes, beans, nuts and seeds, 3  High fiber 100% whole grains,
Sources of complex carbohydrates include include beans, lentils, starchy vegetables and whole grains, such as cereal or whole-wheat or multi-grain bread.Eat whole grains as part of a balanced diet along with other carbohydrates, healthy fats and lean proteins.hole Grains. All grains are sources of complex carbohydrates, but whole grains are especially healthy sources because they include heart-healthy nutrients such as selenium, potassium and magnesium.