PLANET EARTH (PLANETA TIERRA)
WHAT YOU HAVE TO LEARN (QUÉ TIENES QUE APRENDER)
*The Solar Sistem and the Earth
The Sun
The eight planets: innner and outer planets
The Earth
The Moon
*The Earth´s movements
Rotation
Revolution
*Our planet Earth
The Eatrh´s layers: hydrosphere, atmosphere and geosphere.
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