Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what...
-
Upload
lora-simon -
Category
Documents
-
view
237 -
download
2
Transcript of Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what...
![Page 1: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/1.jpg)
Convection Currents and the Mantle
• OBJECTIVES:– Explain how heat is transferred– Identify what causes convection currents
![Page 2: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/2.jpg)
Radiation
• The transfer of energy through empty space
• Examples:
-Sunlight
-Open flame
![Page 3: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/3.jpg)
Conduction• Heat is transferred by
direct contact of particles of matter
• Heat travels from hot to cold
• Examples:– Hot frying pan, Fire poker
stick
![Page 4: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/4.jpg)
Convection• The movement of a fluid,
caused by differences in temperature and density, that transfers heat from one part of the fluid to another
• Examples: -Heating water-Mantle in the Asthenosphere-Air --wind
![Page 5: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/5.jpg)
Checkpoint-1
• What are the three types of heat transfer?
![Page 6: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/6.jpg)
ANSWER-1
• RADIATION
• CONDUCTION
• CONVECTION
![Page 7: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/7.jpg)
Checkpoint-2
• Describe how convection currents form?
![Page 8: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/8.jpg)
ANSWER-2• The heating and cooling of a fluid changes in a
fluid’s density, and the forces of gravity combine to set convection currents in motion.
![Page 9: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/9.jpg)
Checkpoint-3
• In general, what happens to the density of a fluid when it becomes hotter?
![Page 10: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/10.jpg)
Answer-3
• In general, when a fluid is heated, its density decreases. --i.e.steam and ice
![Page 11: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/11.jpg)
Checkpoint-4
• What happens to convection currents when a fluid reaches a constant temperature?
![Page 12: Convection Currents and the Mantle OBJECTIVES: –Explain how heat is transferred –Identify what causes convection currents.](https://reader036.fdocuments.net/reader036/viewer/2022081514/56649e245503460f94b12e7a/html5/thumbnails/12.jpg)
ANSWER-4
• When a fluid reaches a constant temperature, the convection currents stop.