Social Science Unit 3 Earth and space

Hi!!!

Here is the most important information you need to know.

You should study a lot because it is a very difficult unit. If you do not understand something, please let me know and I will explain it to you.

YOU CAN!!!!

THE EARTH MOVEMENTS

ROTATION: The Earth spins on its axis.

It takes 24 hours.

It produces the DAY/NIGHT

REVOLUTION: The Earth orbits the Sun.

It takes 365 days and 6 hours.

It produce the SEASONS because the Earth is TILT

There are four seasons in a year. The Earth´s axis is tilted as it orbits around the sun.

1- Winter is colder because the North Pole tilts away from the Sun.

It is summer in the South Hemisphere.

2- On the spring and autumn equinoxes (equal night) Northern and

Southern Hemispheres receive equal amount of sunlight.

3- In Summer, the day is longer and warmer. It is because the

North Pole is tilting towards the Sun.

In the Southern Hemisphere it is winter.

PHASES OF THE MOON

The Moon orbits the Earth. It takes 28 days.

Depending on the position of the Earth, we see different lunar phases.

TIDES

Tides are the rise and fall of the seas and oceans.

They are caused by the gravitational force of the Moon.

It rises and falls every 6 hours, so there are two high tides and two low tides every day.

HEMISPHERES, LATITUDE AND LONGITUDE

In some maps there are some imaginary lines that help us locate things in it.

• The horizontal lines are parallels.
• The vertical lines are meridians.

The latitude of a place is its distance from the Equator.

The Equator is 0º latitude.

The longitude of a place is its distance from the Greenwich Meridian.

Greenwich Meridian is 0º longitude.