This presentation is about the Earth's Energy Balance.

1. THE EARTH'S ENERGY
BALANCE
THE SIGNIFICANCE OF THE EARTH'S AXIS & REVOLUTION AROUND THE
WORLD.

2. LEARNING
OBJECTIVES
• List the causes of seasons.
• Define revolution of the Earth.
• Demonstrate the rotation of the Earth
using a Globe.
• Differentiate summer and winter
characteristics.
• Value the solstice and the dates where
the Sun directly overhead the Equator.
• Create a Globe.

3. WHAT CAUSES SEASONS?

4. WHAT
CAUSES
SEASONS?
Revolution – it is whereby the Earth
revolve around the Sun for 365/366 days.
Rotation – it is whereby the Earth rotate
on it own axis for 24 hours.
Tilt – it is whereby the Earth is titled 23,5
degrees from the perpendicular.
Sphericity – it is the ball like shape of the
Earth that produces uneven insolation.

5. WHAT ARE SEASONAL
EFFECT ON THE ENERGY
BALANCE?

6. WHAT ARE SEASONAL EFFECT ON THE ENERGY
BALANCE?
More heat is received in summer than in winter.
• The Earth axis is tilted.
• It is the summer season each hemisphere that is tilted towards
the Sun.
• In summer we have longer daytime.
• In winter when each hemisphere is titled away from the Sun, it
receives less incoming radiation.
• In winter we have shorter daytime.

7. WHAT ARE SEASONAL
EFFECT ON THE
ENERGY BALANCE
• The Sun is directly overhead
the Equator, twice a year, it is
on the 21 of March and 23 of
September.
• All places on the Earth have
12-hour day and 12-hour
night.
• Both hemisphere get equal
solar radiation.

8. WHAT ARE
SEASONAL
EFFECT ON
THE
ENERGY
BALANCE?
The Northern Hemisphere is tilted towards the Sun on the
21 of June. The longer days and shorter nights causes the
Northern Hemisphere to experience summer season.
The Southern Hemisphere is tilted away from the Sun,
causing winter season. The shorter days and longer nights
are experienced during this season.
On December 21 the reverse happens with long days, short
nights and summer in the Southern Hemisphere.
The Northern Hemisphere has long nights, short days and
winter.

9. THE END

10. REFERENCE
Sutherland, C. (2013) Oxford in search of
geography. Cape Town: Oxford University Press
Southern Africa.
Singh, M., Pillay, V. and Chandrabhaon, S.,
2020. EXCEL in Geography.