The biosphere is a global ecosystem composed of living organisms (biota) and the abiotic (nonliving) factors from which they derive energy and nutrients.īefore the coming of life, Earth was a bleak place, a rocky globe with shallow seas and a thin band of gases-largely carbon dioxide, carbon monoxide, molecular nitrogen, hydrogen sulfide, and water vapour. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.īiosphere, relatively thin life-supporting stratum of Earth’s surface, extending from a few kilometres into the atmosphere to the deep-sea vents of the ocean.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.

When does eco global survival come out