RLAF+1.2

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**Vocabulary**

 * Heat transfer:** The movement of energy from a warmer object to a cooler object
 * Radiation:** The transfer of energy through empty space
 * Conduction:** Heat transfer by direct contact of particles of matter
 * Convection:** heat transfer involving the movement of fluids,liquids, and gases
 * Convection current:** The flow that transfers heat within a fluid
 * Density:** A measure of how much mass there is in a volume of substance

Radiation

 * sunlight is the radiation that warms the Earth's surface
 * one form of radiation is the heat that you feel around a open fire

**Conduction**

 * the particles near the bottom vibrate faster as they're heated
 * For example: Heat is transfered from the hot soup to the cool spoon

Convection

 * during convection the heated particles of the fluid began to flow
 * Heat transfer involves the movement of fluids,liquids and gases

Convection in Earth's mantle

 * Earth's mantle responds to heat
 * In the Earth the cycle of rising and sinking takes place

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