Heat comes from various kinds of heat transfers, such as radiation. But while placing your hand above a campfire, a lot of convection currents rises towards you. Changes in the weather- The cool air and breeze occurring near to a beach are all the effects of convection currents. Most thermal energy in the atmosphere moves by convection. Convection is the transfer of thermal energy by the movement of a liquid or gas. Convection works when a liquid or gas is unevenly heated. Hot liquids are less dense and rise, causing. Some currents are caused by convection, while others, called surface currents, are driven by wind. These currents move water all around the earth, bringing warm water to cooler areas and vice versa. This redistributes thermal energy and causes changes in the weather.

Convection works by areas of a liquid or gas heating or cooling greater than their surroundings, causing differences in temperature. These temperature differences then cause the areas to move as the hotter, less dense areas rise, and the cooler, more dense areas sink.

https://www.metoffice.gov.uk/weather/learn-about/weather/how-weather-works/what-is-convection

Thanks Dr. Manal Hadi Kanaan for participating in the discussion.

The heat energy can be transferred by the process of convection by the difference occurring in temperature between the two parts of the fluid. Due to this temperature difference, hot fluids tend to rise, whereas cold fluids tend to sink. This creates a current within the fluid called convection current. Convection works when a liquid or gas is unevenly heated. Hot liquids (and gases) are less dense and rise, causing. The warmer section of the material will rise while the cooler part sinks. This creates a current of warmer material going up and a current of cooler material going down. Thermal energy also moves within the ocean and within the atmosphere through the process of convection. During convection, cooler water or air sinks, and warmer water or air rises. This movement causes currents. Ocean currents are like rivers of water moving through the sea. In the atmosphere, as air warms it rises, allowing cooler air to flow in underneath. Along with the turning of the Earth, this movement of air creates winds. Winds, in turn, create surface waves on the ocean. Convection also plays a role in the movement of deep ocean waters and contributes to oceanic currents. Convection within the atmosphere can often be observed in our weather. For example, as the sun heats the Earth's surface, the air above it heats up and rises. If conditions allow, this air can continue to rise, cooling as it does so, forming Cumulus clouds. Because of the Earth's surface is unevenly heated, there are big differences in air temperature from the equator to the poles and over different types of terrain. These temperature differences are what cause convection in the atmospheric and air to circulate over the globe.