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Why isn't Earth's atmosphere as thick as Venus's?a. Earth's thick atmosphere mostly leaked away into space during the large impact when the Moon was formed.b. Earth was cool enough to outgas much less carbon dioxide and more water vapor at the stage of planet differentiation.c. Earth was cool enough to form large liquid water oceans that allowed much of the carbon dioxide to be dissolved from the atmosphere.d. Earth's volcanism is much weaker because of plate tectonics, and volcanoes are the main source of carbon dioxide in the atmosphere.

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Definition: slight difference; subtle variation Synonyms: dash, degree, distinction, gradation, hint, implication, refinement, shade, shadow, subtlety, suggestion, suspicion, tinge, touch, trace

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