1. Why are the Humid tropics located where they are?
The Sun-Earth relationship.(Key Concept)
Heating of the Earth:
Heat Absorption from the Sun’s Heat Rays

2. Our Solar System Planet Distance from Sun (km) Diameter (km) Mercury
57,910,000
4,879
Venus
108,200,000
12,104
Earth
149,669,000
12,756
Mars
228,096,000
6,794
Jupiter
778,400,000
142,984
Saturn
1,429,725,000
120,536
Uranus
2,870,980,000
51,118
Neptune
4,498,250,000
49,528

3. The Earth Distance from Sun 149,669,000km
The only known planet that life exist.
Has water
Has oxygen
Average Temperatures are tolerable for life to exist.

4. Sun-Earth Relationship

5. Angle of the Sun’s rays and its effect on the amount of heat absorbed by the different parts of the Earth
More or less overhead Sun’s rays
at the Equator
Low angle of Sun’s rays at the Tropic of Cancer
Effect on temperature by the heat energy absorbed by the Earth?
Effect on temperature by the heat energy absorbed by the Earth?
Heat energy is spread out over smaller surface area – more heat absorbed per unit square – Earth is overall hotter
Heat energy is spread out over larger surface area – less heat absorbed per unit square – Earth is overall cooler

8. Atmosphere

10. Is the Earth tilted at its axis?
Line of Axis

11. Has the tilt of the Earth have an influence on the amount of heat absorbed by the Earth?

12. Tilted Axis of the Earth

13. 2 Movements of the Earth Rotation about its tilted axis (23.5o)
Revolution of the Earth around the Sun.
What do these 2 movements together lead to?

14. 2 Movements of the Earth Rotation about its tilted axis (23.5o)
Revolution of the Earth around the Sun.
What do these 2 movements together lead to?
Day/Night
Differring Seasons
What does this mean?

15. 2 Movements of the Earth Rotation about its tilted axis (23.5o)
Revolution of the Earth around the Sun.
What do these 2 movements together lead to?
Day/Night
Differring Seasons
= differing climates & living conditions on Earth

16. Rotation of the Earth about its tilted axis of 23.5o
The rotation of the Earth causes : Day and Night

17. The Earth’s Revolution and Rotation about its tilted axis
Video : 1. The 4 Seasons 2. Differing Lengths of Day and Night.

18. The Revolution of the Earth about its tilted axis and the 4 Seasons
Mar 21
Dec 22
June 21
Sept 23

19. Differing lengths of Day and Night
24 hours Night B
Longer Night
Sun’s rays
Day
Nightt
Equal length of Day and Night C
24 hours Day D
Longer Day E