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Take A QuizEarth observation (EO) is the gathering of information about the physical, chemical, and biological systems of the planet Earth. It can be performed via remote-sensing technologies and by ground-based techniques. According to the Group on Earth Observations (GEO), the concept encompasses both "space-based or remotely-sensed data, as well as ground-based or in situ data."Earth observation is used to monitor and assess the status of and changes in natural and built environments.
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