1. describe the differences between radiation, conduction, and convection.
2. describe the heat transfer cycle between the sun, the earth, and the earth’s atmosphere.
3. describe three natural factors that can affect the earth’s climate.
4. describe three human caused factors that can affect the earth’s climate.

1. Radiation - energy transmits through particles that ionize. Conduction - heat is transferred through a substance without moving the material. Convection - transfer of heat through movement.

2. Earth receives energy from the sun, which is transferred between Earth and its atmosphere.

3.Wildland fires, dust storms, and volcanic activity. They release CO2, CH4, N20, and sulfur dioxide.

4. Burning coal, releases carbon dioxide and other pollutants. Gasoline, releases air pollution. Factories, releases carbon dioxide, methane, and nitrous oxide.

one of the most common forms of pain or discomfort we feel during strenuous exercise is a burning sensation in our lungs or muscles that goes away shortly after we cease the activity. this is caused by a build-up of lactic acid.