Natural sources:
Artificial sources:
Most of the atmosphere's gas never escapes the planet. Most of the gas in our atmosphere is from natural sources. They do not escape and have never escaped.
There are a two main sources of dust particles in the atmosphere. A large quantity of dust results from micro-meteoroids that burn up in the atmosphere and turn into dust. In areas of drought, soil can dry up and turn into dust which can then blow away on the wind.
More precisely I would say that petroleum is a natural resource. There are many kinds of oils.
Best Answer to this Q'n is: repeatedly, and as often as possible [under varying conditions]. Individual carbon dioxide (CO2) molecules spend an average of 3-4 years in the atmosphere (the residence time), before moving on as part of the carbon cycle. However, because CO2 leaving the atmosphere is offset by CO2 from natural carbon sources, it takes a lot longer than this for artificial CO2 increases to dissipate - up to a thousand years. This is called the turnover time, or the global atmospheric lifetime.
Could be windblown dirt/soil/sand. Could be expulsion from factories and coal fired power plants. Could be volcanic release. Could be micro-meteorites.
The difference between natural and artificial sources of light is that natural sources are produced by the sun while artificial light sources illuminate using energy from other sources and include incandescent bulbs.
Natural sources : sun, firefly Artificial sources: oil lamps, tube lights
Most of the atmosphere's gas never escapes the planet. Most of the gas in our atmosphere is from natural sources. They do not escape and have never escaped.
Evaporation. Sunlight hitting any liquid water will cause the water to evaporate into its gaseous state.
Americium is an artificial element, a natural source doesn't exist.
There are natural and artificial light sources. A few examples of natural light sources include the Sun, stars, and candles. A few examples of artificial light sources include light bulbs, lamp posts, and televisions.
Deplet
Particles the size of sand grains that come from many sources
There are a two main sources of dust particles in the atmosphere. A large quantity of dust results from micro-meteoroids that burn up in the atmosphere and turn into dust. In areas of drought, soil can dry up and turn into dust which can then blow away on the wind.
A primary light source is one that actually produces light, such as a light bulb or the sun. A secondary light source in one that ONLY reflects the light produced by a primary light source. It doesn't produce light itself, such as a mirror or the moon.
Technetium is an artificial chemical element and is extracted from fission products, prepared by neutron activation or by irradiation in particles accelerators.
Sources of cloud condensation nuclei can be both natural and human-caused. Natural sources of cloud condensation nuclei include volcanic dust, sea spray salt, and bateria Humans also release unnatural chemicals into the air from the burning of fossil fuels and from industrial sources