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Why is the atmosphere of Earth the outermost layer of the planet? A. It contains oxygen. B. It is the least dense. C. It is the thinnest layer. D. It does not contain matter.

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Lucas

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Answer

B

Explanation

The atmosphere of Earth is the outermost layer of the planet because it is the least dense. The Earth's structure consists of several layers, including the crust, mantle, outer core, and inner core. The atmosphere is the layer that surrounds the Earth and is primarily composed of gases, including nitrogen, oxygen, and trace amounts of other gases. It is the least dense layer compared to the solid and liquid layers beneath it. This is because the gases that make up the atmosphere are less dense than the solid and liquid materials that constitute the Earth's inner layers. Therefore, the atmosphere floats above these layers, making it the outermost layer of the planet. Options A, C, and D are incorrect for the following reasons: - A: While it's true that the atmosphere contains oxygen, this is not the reason it is the outermost layer.- C: The atmosphere is not the thinnest layer; the Earth's core layers are much thinner in comparison.- D: The atmosphere does contain matter in the form of gases, so this statement is incorrect.

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