THE+EARTH,+OUR+PLANET

The Earth is the third planet in the Solar System. It is also called the blue planet... Guess why?



 This is the presentation Barbara prepared for us:



=Our planet, the Earth, has a satellite, the Moon.= =A satellite is a natural body in space that revolves around a planet.= =The Moon has not its own light, it reflects the Sun light. As it revolves the Earth we can see the Moon changing shape. We call these diferent shapes "phases of the Moon".=

The revolution of the Moon around the Earth makes the Moon appear as if it is changing shape in the sky. From Earth we see the Moon grow from a thin crescent to a full disk (FULL MOON) and then shrink back to a thin crescent again before vanishing for a few days (NEW MOON).

media type="youtube" key="xBc8QHSsFgE" width="387" height="216" align="left" media type="youtube" key="76-HAqNKqKA" width="386" height="216" align="right" = = == = = = Rotation =  =The Earth rotates on its axis from west to east.= =The axis is an imaginary line passing through the northern and the southern= =poles.= =Earth's rotation is completed in about 24 hours .= =This motion is responsible for the occurrence of day and night.=

**Revolution** **The Revolution of The Earth Around Our Sun** = Throughout the year, as our small blue planet orbits the Sun, many parts of the Earth experience changing seasons. The warm Spring brings new flowers and young animals. This is followed by a hot Summer filled with vacations and outdoor swimming. Following Summer is another warm season known as Autumn, where leaves turn beautiful shades of reds and browns before falling from their trees. Finally, after all of these warmer seasons, comes one that is cold, wet, and dry, known as Winter. =

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=The four spheres of Earth= media type="youtube" key="CmbXcNh4FcM" width="560" height="315" align="left"

**geosphere:**  rocks, minerals and ground

=hydrosphere:= all the water on Earth

=biosphere:= animlas, plants and people

**atmosphere:** air surrounding the Earth

**INTERESTING LINKS ABOUT THE EARTH, THE SUN, THE MOON AND THE EIGHT PLANETS IN OUR SOLAR SYSTEM:**

http://www.kidsastronomy.com/the_planets.htm

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These are the layers of the Earth: