The document discusses imaginary lines used on maps and globes to describe locations on Earth, including meridians that run from the North to South poles and are measured in degrees east or west, and parallels that run horizontally around the planet and are measured in degrees north or south. It also briefly outlines that the Earth rotates on its axis over 24 hours, causing day and night, and that it has three main layers - the atmosphere, hydrosphere, and geosphere. Finally, it states that astronomers study objects in space like the sun, moon and planets.

1. SOCIAL SCIENCES
THE PLANET EARTH

2. IMAGINARY LINES
• On maps and globes there are imaginary lines.
We use these lines to describe a location on
the Earth’S surface. The vertical lines from the
North pole to the South pole are called
meridians. They are measured in degrees East
or West. Meridian 0 is the Greenwich
Meridian. The horizontal lines around the
earth are called parallels. They are measured
in degrees North or South.

3. North Pole
South pole
Northern Hemisphere
Southern Hemisphere
Parallels
Equator
Meridians
Grenwich Meridian

4. THE EARTH MOVEMENT
• Rotation is the movement of the Earth on its
own axis. It spins around the earth. It takes 24
hours to make a complete rotation. It causes
day and night.

5. THE EARTH LAYER
• The Earth has three main parts: the
atmosphere, the hydrosphere and the
geosphere.

6. • The astronomers study the Sun , the
Moon,planets and other objects in space.