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OUR PLANET, THE EARTH
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.
RotationRevolution
MOVEMENTS OF THE EARTH
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.
Rotation consequences
Day and Night
http://www.juntadeandalucia.es/averroes/~29701428/ccnn/flash/tierra.swf
Revolution Movement
• It is our planet’s movement around the Sun.• It describes an eliptical orbit.• It takes 365 days to complete a revolution.
Revolution consequences
June 21stDecember21st
September 22nd
March 20th
The Seasons
http://www.juntadeandalucia.es/averroes/~29701428/ccnn/flash/tierra.swfhttp://www.juntadeandalucia.es/averroes/~29701428/ccnn/flash/fase_estaciones.swf
THE MOON
• 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.
Las Fases de la Luna
http://rincones.educarex.es/byg/index.php/1-eso-la-tierra-en-universo/animaciones?showall=1&limitstart=
THE EARTH’S SPHERES
GEOSPHERE
• Is the solid (rocky) part of Earth. • We can distinguish three parts in it:
– Crust.– Mantle.– Core.
HIDROSPHERE
• Is all the water on, under and above the Earth:– Solid (ice).– Gas (water vapour).– Liquid: salty / fresh.
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.
BIOSPHERE
• All the living things which inhabit the Earth.
LA SUPERFICIE TERRESTRE
• Relieve Continental:– Cadenas Montañosas (cordilleras).– Llanuras.– Plataformas continentales.
RELIEVE SUBMARINO
• Cordilleras oceánicas.• Fosas marinas.• Llanuras abisales.• Volcanes submarinos.
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