Which of these is NOT part of the biosphere?

Answer Chronosphere

The biosphere extends from the deepest root systems of trees, to the dark environment of ocean trenches, to lush rainforests and high mountaintops. The solid surface layer of the Earth is the lithosphere. The atmosphere is the layer of air that stretches above the lithosphere. The Earth's water -- on the surface, in the ground, and in the air---makes up the hydrosphere.

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