What makes up earth's biosphere

The biosphere, (from Greek bios = life, sphaira, sphere) is the layer of the planet Earth where life exists ... The biosphere is one of the four layers that surround the Earth along with the lithosphere (rock), hydrosphere (water) and atmosphere (air) and it is the sum of all the ecosystems.

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.