👉 Invection is a type of movement that occurs when heat or other forms of energy are transported through the Earth's atmosphere. In this case, it refers to the movement of heat from one location to another at a speed greater than the speed of sound, which is typically around 340 meters per second (mph). Invection can occur in many different ways, including convection currents that move warm and cold air masses together or convection currents that cool and warm a region.