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The Earth's Biosphere
The biosphere is the defined as the sphere or area around the planet Earth where life exists. This zone of life is vast. Most life forms live on, or near the surface of Earth. However, some live deep within the hydrosphere (oceans, lakes, and streams), while others thrive in the depths of the lithosphere (solid portion of Earth). For this reason, mapping the exact borders of the biosphere is quite challenging.
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