GWBN+1.2

earth's outer core is as hot as the sun===Section 1.2=== toc

Vocabulary

 * heat transfer** -the movement of energy from a warm object to a cold object


 * radiation** -heat transfer through an empty space


 * conduction** -heat transfer by direct contact


 * convection** -heat transfer by the movement of direct contact


 * density** -the amount of mass and volume in a substance


 * convection current** -the flow that transfers heat within a fluid

Outline
-Eath's outer core is as hot as the sun -heat is always transfered from a warmer substance to a cooler substance -three types of heat transfer, radiation, conduction, and convection
 * Summmary**

-heat transfer by radiation takes place with no contact between heat source and object -radiation lets the sun heat the Earth's surface
 * Radiation**

-heat transfer by direct contact -when spoon heats up in pot of soup heat from the pot and soup is transferd to the particals that make the spoon, gradually the entrie spoon heats up
 * Conduction**

-heat transfer by the movement of a heated fluid -heat transfer by fluids are caused by differences of temperature and density within a fluid -when a liquid is heated particles move faster and spread apart which causes it to occupy more space amd becomes less dence -the heating and cooling of fluids changes in the fluids density, and the force of gravity combine to set convection currents into motion -with out heat the convection currents will eventually stop when all the material meets the same temperature
 * Convection**

-
 * Convection in Earth's Mantle**

-