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We're so excited to continue to grow and support the parents and teachers championing children's education.
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KidsKnowIt Network is now part of Education.com!

The Earth’s Biosphere


The biosphere is defined as the sphere or area around the planet Earth where life exists. This zone of life is vast. Most lifeforms 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.