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Within the stratosphere is the ozone layer, a component that partially shields the surface from ultraviolet light and thus is important for life on Earth. The Kármán line, defined as 100 km (62 mi) above Earth's surface, is a working definition for the boundary between the atmosphere and outer space. [236]
Understanding planetary habitability is partly an extrapolation of the conditions on Earth, as this is the only planet known to support life.. Planetary habitability is the measure of a planet's or a natural satellite's potential to develop and maintain an environment hospitable to life. [1]
The term is most often applied to Earth or some parts of Earth. This environment encompasses the interaction of all living species, climate, weather and natural resources that affect human survival and economic activity. [1] The concept of the natural environment can be distinguished as components:
Habitat can be defined as the natural environment of an organism, the type of place in which it is natural for it to live and grow. [ 4 ] [ 5 ] It is similar in meaning to a biotope ; an area of uniform environmental conditions associated with a particular community of plants and animals.
The diversity of life on Earth is a result of the dynamic interplay between genetic opportunity, metabolic capability, environmental challenges, [90] and symbiosis. [91] [92] [93] For most of its existence, Earth's habitable environment has been dominated by microorganisms and subjected to their metabolism
The Second International Conference on Closed Life Systems defined biospherics as the science and technology of analogs and models of Earth's biosphere; i.e., artificial Earth-like biospheres. [8] Others may include the creation of artificial non-Earth biospheres—for example, human-centered biospheres or a native Martian biosphere—as part ...
Doers actively engage in environmental aid, such as volunteering for hands-on work like cleaning up oil spills. Donors support causes financially or through gifts in kind, including fundraising or personal donations. Practitioners work daily in environmental stewardship, acting as advocates in collaboration with various environmental agencies ...
Earth's climate system is a complex system with five interacting components: the atmosphere (air), the hydrosphere (water), the cryosphere (ice and permafrost), the lithosphere (earth's upper rocky layer) and the biosphere (living things). [28]: 1451 Climate is the statistical characterization of the climate system.
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