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Earth was able to retain an atmosphere because of _____. its gravity volcanic outgassing meteorite impacts cyanobacteria

User Inafalcao
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Answer:

A

its gravity

Step-by-step explanation:

User Treddy
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Earth was able to retain an atmosphere because of its gravity. The Earth has a gravity that is forceful enough to retain its atmosphere (which is six times than the moon's) and has the ability to block the solar wind that will probably strip the atmosphere off. 
User ParagJ
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