Atmosphere and Ocean
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through earth NOT to earth Carbon dioxide doesn't absorb the energy from the sun, but it does absorb some of the heat energy released from the earth. So in effect, carbon dioxide lets the light energy in, but doesn't let all of the heat energy out, similar to a greenhouse. Atmosphere and Ocean - 7 
There are three ways that heat travels on earth. conduction: heat moves from direct contact between two or more objects; things touching
radiation: heat moves with no contact between objects; pure energy; sunlight to earth convection: heat is carried between objects by a medium - liquid or gas; heater/fan; boiling water, wind, magma 
Most energy on earth travels in convection currents. A convection current is a moving wave of liquid (water) or gas (air) caused by heat spreading molecules apart. Heat energy causes a liquid or gas to rise because it gets lighter. As the heat is slowly lost, the molecules get cooler and heavier and sink. This movement causes currents.
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