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,
Carbohydrates Carbohydrates are an essential part of a healthy diet. They should not be eliminated from oneâs diet as part of a weight loss diet, such as the popular âno-carb diets.â The best sources of carbohydrates are whole grains, fruits, vegetables, and beans.These are also excellent sources of vitamins, minerals, and fiber.uring pregnancy, there is a higher need for some vitamins and minerals. These can be obtained through eating healthy foods, such as fruits, vegetables, whole grains, etc. Use the SuperTracker website or MyPlate for Moms (also available in Spanish) to identify the quantity and types of foods to be eaten.