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.

Effect of difference of distance from the sun between the equator and poles is minimal, compared to the difference of angle at which sunlight is received

Atmosphere

Sun-Earth Relationship

Even more angled! = even larger surface area = more spread out

Angle of the Sun’s rays and its effect on the amount of heat absorbed by the different parts of the Earth

Low angle of Sun’s rays at the Tropic of Cancer

More or less overhead Sun’s raysat the Equator

Effect on temperature by the heat energy absorbed by the Earth?Heat energy is spread out over larger surface area – less heat absorbed per unit square – Earth is overall cooler

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

Tilted Axis of the Earth

Is the Earth tilted at its axis?Line of Axis

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

Is the Earth tilted at its axis?Line of Axis

Series of hottest areas on Earth over half a year

[ML101 NOT] Has the tilt of the Earth have an influence on the amount of heat absorbed by the Earth?

DARKNESS

[ML101 NOT] Has the tilt of the Earth have an influence on the amount of heat absorbed by the Earth?

NOT!!

Rotation of the Earth about its tilted axis of 23.5o

The rotation of the Earth causes : Day and Night

The Latitudes

66.5oN

23.5oN

0o

23.5oS

66.5oS

North Pole 90oN

South Pole 90oS

Sun’s rays

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?

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 How?

Seasons

• Rotation of Earth about its tilted axis (23.5o)• Revolution of the Earth around the Sun…

…lead to unequal distribution of heat at different parts of the world at different times of the year

• Therefore, Differring Seasons

Differing lengths of Day and Night23.5O

Sun’s raysNighttDay

A

B

C

DE

24 hours Night

24 hours Day

Equal length of Day and Night

Longer Night

Longer Day

The Revolution of the Earth about its tilted axis and the 4 Seasons

June 21 Dec 22

Mar 21

Sept 23

Can you explain the seasons?

http://www.thesourcefm.co.uk/node/597