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For the past 25 years, satellites chronicled global change on Earth.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
Scientists say that future humans could use passing asteroids to catapult Earth further from the Sun before it becomes too hot for us to live.
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The Curiosity Rover on Mars found evidence of a stream bed that would have been suitable on Earth. Now the search is really on for hard evidence of life.
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Atmospheric carbon dioxide levels reach 400 ppm and no one knows what the outcome of this experiment will be.
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Hipervinculo Ciencias de la Tierra y Medioambiente
The 2013 IPCC report makes five major points including that warming is happening and humans are mostly to blame.
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Covers the consequences of recent tsunamis.
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Hipervinculo Física
Understand the Big Bang theory and the aftermath of the Big Bang.
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Hipervinculo Biología
Overview of the basic concepts behind evolution.
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Hipervinculo Biología
Introduces the cellular respiration, glycolysis, the Krebs Cycle, and the electron transport chain.
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Hipervinculo Biología
This is the teacher's guide for the Your Changing Body unit of a middle school Human Biology book.
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