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,
Answer   Your body gets carbohydrates from the foods we eat. Excellent sources of carbohydrates include bread, cereal, rice, grains, potatoes and other fruits and â¦ vegetables. Your body can get carbohydrates from other foods as well but they may be mixed with the other two large nutrients -- fat and protein. 3 people found this useful.