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Hipervinculo Matemáticas
A common misconception is that explorers like Columbus sailed to sea to prove that the earth is not flat. It has been known for thousands of years that not only is the earth NOT flat, but its circumfe ...
Hipervinculo Ciencias de la Tierra y Medioambiente
Describes how and why seasons occur.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
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