When you warm air, it rises. Cool air will sink. Ultimately, the motion leads to a convection cell, with air rising, moving to the side, falling, and moving back. This heat-driven motion of air moves heat around in the atmosphere.

The colder, denser part of the fluid descends to settle below the warmer, less-dense fluid, and this causes the warmer fluid to rise. Such movement is called convection, and the moving body of liquid is referred to as a convection cell.

Convection cells occur in Earth’s atmosphere on both small and large scales. A sea breeze, for example, can be the result of a convection cell. Water holds heat better than land. This means that when the sun rises, the air on land warms more quickly than the air above the water.

that air moves anticlockwise around a low pressure centre and clockwise around a high pressure centre in the northern hemisphere as a result of the earth’s rotation; movement of air due to temperature differences is known as convection or advection (see also lesson 2);

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.

Convection currents play a role in the circulation of fluids. Convection currents are the result of differential heating. Inside Earth, the convection of mantle material is thought to cause the movement of the overriding crustal plates, resulting in events such as earthquakes and volcanic eruptions.

convection currents occur when a heated fluid expands, becoming less dense, and rises. The fluid then cools and contracts, becoming more dense, and sinks.

The shape of a convection current would be circular. Convection currents are caused by the very hot material at the deepest part of the mantle rising, then cooling, sinking again and then heating, rising and repeating the cycle over and over.

The air would still be too thin to breathe. The lack of atmosphere would chill the Earth’s surface. We’re not talking absolute zero cold, but the temperature would drop below freezing. Water vapor from the oceans would act as a greenhouse gas, raising the temperature.

The primary sources of thermal energy for mantle convection are three: (1) internal heating due to the decay of the radioactive isotopes of uranium, thorium, and potassium; (2) the long-term secular cooling of the earth; and (3) heat from the core.

The heat from the Sun reaches Earth through convection. Mantle material rises in cenvection currents because heated materials become more dense.

Energy is transferred from the sun to Earth via electromagnetic waves, or radiation. Most of the energy that passes through the upper atmosphere and reaches Earth’s surface is in two forms, visible and infrared light. This transfer of energy can take place by three processes: radiation, conduction, and convection.

Thermal radiation is one of three ways that thermal energy can be transferred. The other two ways are conduction and convection, both of which need matter to transfer energy. Radiation is the only way of transferring thermal energy that doesn’t require matter.

And unless people interfere, thermal energy — or heat — naturally flows in one direction only: from hot toward cold. Heat moves naturally by any of three means. The processes are known as conduction, convection and radiation.

Heat is transferred by conduction when adjacent atoms vibrate against one another, or as electrons move from one atom to another. Conduction is the most significant means of heat transfer within a solid or between solid objects in thermal contact.