What is Earth Science? The short answer is that Earth Science is the study of the Earth and its neighbors in space.
Earth Science is generally divided into four disciplines:
Geology (the study of the earth) is a science that deals with the study of the Earth's materials, structures, and processes.
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Meteorology is a science that deals with the study of atmosphere and how processes in the atmosphere affect weather and climate (long term weather patterns).
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Oceanography is a science that involves the study of Earth's oceans and seas and their composition, patterns, and processes. This science also includes the study of the organisms that inhabit the oceans.
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Astronomy is the study of the universe. It includes the study of how nearby celestial bodies influence the Earth.
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To learn more about Earth Science please check out this series of videos produced by the American Geosciences Institute.