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Grade 11 Geography Atmosphere notes.pptx

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Brilliant Maredi
Brilliant Maredi

The focus of the PowerPoint highlights the unequal heating of the atmosphere and the significance of Earth's axis and revolution around the Sun.

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THE ATMOSPHERE GEOGRAPHY GRADE 11 TERM 1
UNIT 1: THE EARTH'S ENERGY BALANCE This Photo by Unknown author is licensed under CC BY-SA-NC.
Unequal heating of the atmosphere Earth is heated by incoming solar radiation(insolation) The Earth then transfers the heat into the atmosphere The amount of heat in the atmosphere depends on the amount of insolation However, insolation is not equal all over the world It depends on two factors: Latitudes and Seasons
LATITUDES Insolation is greatest at the equator due to more direct sunlight on a smaller and closer area Insolation decreases as you get further north or south from the equator, because the insolation travels further and heats up larger areas This Photo by Unknown author is licensed under CC BY. This Photo by Unknown author is licensed under CC BY-SA.
SEASONS As the Earth revolves around the sun, different areas will receive different amounts of insolation and rainfall, due to the tilt of the Earth This Photo by Unknown author is licensed under CC BY-SA-NC.
THE EARTH'S AXIS The Earth rotates on an imaginary axis It takes 24 hours to complete one rotation A part of the 24 hours the Earth faces the sun and receives insolation (daytime) For the rest of the 24 hours, the Earth receives no insolation (night time) So the amount of heat a certain place gets is dependent on the number of day light hours it gets
The influence of the tilt of the Earth's axis If the Earth's axis was not tilted, all places on Earth would receive equal amounts of sunlight per day and there would be no seasons However, the Earth is tilted at 23.5 degrees This causes unequal lengths of day and night, and unequal heating In summer, the days are longer with more heat, than in winter where days are shorter with less heat This Photo by Unknown author is licensed under CC BY.
The influence of the revolution around the Sun It takes 365.25 days (1 year) to complete 1 full revolution The path it travels is called an orbit At each position in orbit, people in different parts of the world experience different seasons
This Photo by Unknown author is licensed under CC BY-NC-ND.
IN THE SOUTHERN HEMISPHERE Mid summers day is on the 21st December- summer solstice. This is characterized by long warm days and short nights 21stDecember-summer Mid autumn day 21st of March- Autumn equinox. This is when the day and the night are equal in length 21stof March-Autumn Mid winters day on the 21st of June- Winter solstice. This is when days are shorter than the nights with less insolation 21stof June-Winter Mid spring on the 23rd of September- Spring equinox. Equal lengths of days and nights. 23rdof September-Spring
REFERENCES Gifts Africa. (2020). Grade 11 Geography Atmosphere Notes. Available at: https://gifs.africa/wp- content/uploads/2020/06 /Grade-11-Geography- Atmosphere-Notes.pdf This Photo by Unknown author is licensed under CC BY-SA-NC.

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Grade 11 Geography Atmosphere notes.pptx

  • 2. UNIT 1: THE EARTH'S ENERGY BALANCE This Photo by Unknown author is licensed under CC BY-SA-NC.
  • 3. Unequal heating of the atmosphere Earth is heated by incoming solar radiation(insolation) The Earth then transfers the heat into the atmosphere The amount of heat in the atmosphere depends on the amount of insolation However, insolation is not equal all over the world It depends on two factors: Latitudes and Seasons
  • 4. LATITUDES Insolation is greatest at the equator due to more direct sunlight on a smaller and closer area Insolation decreases as you get further north or south from the equator, because the insolation travels further and heats up larger areas This Photo by Unknown author is licensed under CC BY. This Photo by Unknown author is licensed under CC BY-SA.
  • 5. SEASONS As the Earth revolves around the sun, different areas will receive different amounts of insolation and rainfall, due to the tilt of the Earth This Photo by Unknown author is licensed under CC BY-SA-NC.
  • 6. THE EARTH'S AXIS The Earth rotates on an imaginary axis It takes 24 hours to complete one rotation A part of the 24 hours the Earth faces the sun and receives insolation (daytime) For the rest of the 24 hours, the Earth receives no insolation (night time) So the amount of heat a certain place gets is dependent on the number of day light hours it gets
  • 7. The influence of the tilt of the Earth's axis If the Earth's axis was not tilted, all places on Earth would receive equal amounts of sunlight per day and there would be no seasons However, the Earth is tilted at 23.5 degrees This causes unequal lengths of day and night, and unequal heating In summer, the days are longer with more heat, than in winter where days are shorter with less heat This Photo by Unknown author is licensed under CC BY.
  • 8. The influence of the revolution around the Sun It takes 365.25 days (1 year) to complete 1 full revolution The path it travels is called an orbit At each position in orbit, people in different parts of the world experience different seasons
  • 9. This Photo by Unknown author is licensed under CC BY-NC-ND.
  • 10. IN THE SOUTHERN HEMISPHERE Mid summers day is on the 21st December- summer solstice. This is characterized by long warm days and short nights 21stDecember-summer Mid autumn day 21st of March- Autumn equinox. This is when the day and the night are equal in length 21stof March-Autumn Mid winters day on the 21st of June- Winter solstice. This is when days are shorter than the nights with less insolation 21stof June-Winter Mid spring on the 23rd of September- Spring equinox. Equal lengths of days and nights. 23rdof September-Spring
  • 11. REFERENCES Gifts Africa. (2020). Grade 11 Geography Atmosphere Notes. Available at: https://gifs.africa/wp- content/uploads/2020/06 /Grade-11-Geography- Atmosphere-Notes.pdf This Photo by Unknown author is licensed under CC BY-SA-NC.