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# Convection and the Mantle (pages 132–135) - PowerPoint PPT Presentation

Convection and the Mantle (pages 132–135). Types of Heat Transfer (pages 133–134) Key Concept: There are three types of heat transfer : conduction, convection, and radiation.

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Presentation Transcript

### (pages 132–135)

Types of Heat Transfer (pages 133–134) Key Concept: There are three types of heat transfer: conduction, convection, and radiation.

When an object heats up, particles in the object have more energy and move faster. This energy can travel, or transfer, from a warmer object to a cooler object.

Radiation energy and move faster. is the transfer of energy through space. For example, sunlight travels through space by radiation and warms Earth’s surface.

Conduction hold them near a fire.is the transfer of heat between objects that are touching. If you touch a hot pot, heat travels from the pot to your hand by conduction.

Convection hold them near a fire.is the transfer of heat by the movement of particles in fluids such as water. Moving particles transfer heat throughout the fluid.

Circle the letter an example of conduction. sunny day is

a. A sidewalk gets hot on a sunny day.

b. A pot gets hot on a stove.

c. A bench gets hot near a campfire.

Key Concept: Heating and cooling of a fluid, changes in the fluid’s density, and the force of gravity combine to set convection currents in motion.

Remember, convection is the transfer of heat by the movement of particles in fluids. This movement of particles is called a convection current.

Density temperature and density in a fluid. is the amount of mass in a given volume of a substance. A high-density substance feels heavy for its size.

true or false? temperature and density in a fluid. A convection current starts when there are differences in temperature and volume in a fluid.

FALSE

DENSITY

Convection Currents in Earth temperature and density in a fluid. (page 135) Key Concept: Heat from the core and the mantle itself causes convection currents in the mantle.

Convection currents inside Earth are like convection currents in a pot of soup. Hot materials at the bottom rise to the top. Cooler materials at the top sink to

the bottom.

Convection currents in the mantle move very slowly. This is because the mantle is made of solid rock.

Remember, Earth is like a giant magnet because of currents in the outer core. Those currents are convection currents.

Outer Core

Circle the letter of the sentence that correctly describes how convection currents move inside Earth.

a. Hot materials rise, while cooler materials sink.

b. Hot materials sink, while cooler materials rise.

c. Hot materials move up or down, while cooler materials move sideways.