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1. OUR PLANET, THE EARTH

2. The Earth’s Features
• Its atmosphere contains oxygen.
• Its average temperature is 15 ºC.
• Water: solid, liquid, gas: water cycle.
• A natural satellite: The Moon  tides.
• Magnetic field: protects from solar radiations.
• Geological activity.
• Life exists.

4. MOVEMENTS OF THE EARTH
Rotation
Revolution

5. Rotation Movement
• Is the spinning of
the Earth on its axis.
• The time for one
rotation is 24 hours.
• The speed of
rotation is about
1.700 Km/h at the
Equator.

6. Rotation consequences
Day and Night

7. Revolution Movement
• It is our planet’s movement around the Sun.
• It describes an eliptical orbit.
• It takes 365 days to complete a revolution.

8. Revolution consequences
June 21st
December
21st
September 22nd
March 20th
The Seasons

9. THE MOON

10. • It is our only natural satellite.
• It was formed at the same time than the Earth.
• It rotates (its days takes 29 terrestrial days).
• It orbits the Earth at 3.680 Km/h.
• It takes about 28 days to orbit the Earth.
• It has no atmosphere, so it suffers lots of impacts,
which can form craters.

11. Las Fases de la Luna

12. THE EARTH’S SPHERES

13. GEOSPHERE
• Is the solid (rocky) part of Earth.
• We can distinguish three parts in it:
– Crust.
– Mantle.
– Core.

14. HIDROSPHERE
• Is all the water on, under and above the Earth:
– Solid (ice).
– Gas (water vapour).
– Liquid: salty / fresh.

15. ATMOSPHERE
• The layer of air which sorrounds the Earth.
– It contains the oxygen we breath.
– It blocks dangerous solar radiations: UV.
– It keeps an adequated temperature for life.

16. BIOSPHERE
• All the living things which inhabit the Earth.

17. LA SUPERFICIE TERRESTRE
• Relieve Continental:
– Cadenas Montañosas (cordilleras).
– Llanuras.
– Plataformas continentales.

18. RELIEVE SUBMARINO
• Cordilleras oceánicas.
• Fosas marinas.
• Llanuras abisales.
• Volcanes submarinos.