The world around us
8
The Earth has two different movements:
revolution
and
rotation
. Revolution is the movement of the Earth
around the
Sun
. The Earth takes
365
days and 6 hours to make a complete orbit of the Sun. The Earth’s
axis
is another imaginary line. It goes from the North Pole to the South Pole. The axis is
tilted
so as the
Earth moves around the Sun, some places get more light and heat. This causes the
seasons
. The seasons in
the Northern Hemisphere are at different times than they are in the Southern Hemisphere.
Why do we
have different
seasons?
The Earth’s movements
1
Read and match to
revolution
or
rotation
.
a)
It takes 24 hours.
b)
It causes the seasons.
c)
It causes day and night.
d)
It’s the Earth orbiting the Sun.
R E A D & T H I N K
On 21 June
summer
begins
in the Northern Hemisphere
and
winter
begins in the
Southern Hemsiphere.
On 21 September
autumn
begins in the Northern
Hemisphere and
spring
begins in the Southern
Hemisphere.
On 21 March
spring
begins
in the Northern Hemisphere
and
autumn
begins in the
Southern Hemisphere.
On 21 December
winter
begins in the Northern
Hemisphere and
summer
begins in the Southern
Hemisphere.
