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Earth's upper mantle is about 650 km thick and has two distinct layers. Directly beneath the crust is Lithosphere which makes the earth's plates. Beneath Lithosphere is a layer where semi-molten rock flows slowly like hot tar. Name the layer?

[A].	Ionosphere	[B].	Sthenosphere
[C].	Asthenosphere	[D].	Hydrosphere

Answer: Option C

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