Biosphere
The Biosphere is a narrow contact zone of land, water and air.
Explanation:
Biosphere is an ecosystem of the earth where land, water, air meet to interact with each other to support life. It is also known as Ecosphere.
It is in this zone that life exists. It has several species of organisms that resides in biosphere.
It is made of three parts (lithosphere, atmosphere and hydrosphere).