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aerosols and ash can stay on the atmosphere for months or years.
By Plants
Mostly for the same reason you stay close to the surface of the planet - gravity!
Ash.
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aerosols and ash can stay on the atmosphere for months or years.
If you mean our atmosphere, then it depends. If the population of animals does not increase dramatically and us humans "go greener", then the toxic chemicals in our atmosphere will lower and the atmosphere will stay healthy for millions of years. If we stay like we are now, polluting the atmosphere, then the air will get ruined within a few hundred years.
Yes, yes you can!
Carbon in the atmosphere is added by processes like combustion, decomposition and losses from methane sources. It is removed by photosynthesis and, chemical reaction and dissolving in ocean water. As long as the sources exceed the sinks the carbon will stay (and increase) in the atmosphere. Human activities increase the sources and decrease the sinks.
Gravity causes the atmosphere to stay here on Earth, where there is a huge demand for it.
By Plants
The actual atmosphere itself does not change with elevation, but the atmospheric pressure does.
They don't really expire, but they can get ruined by moisture, decomposition and it is recommended that you don't use them after such a long while because you never know how the explosives or casing might have been affected. But, from personal experience black powder (the propellant of the fireworks) tends to stay about the same for a year or two.
As long as they stay babies is how long they stay babies.
Yes. Trees are so important because they turn Carbon Dioxide from the atmosphere into Oxygen which we need to stay alive. So, the more trees that are cut down, the more Carbon Dioxide will stay in the atmosphere.
The ozone hole is not yet closed. And ban on CFC's has been long enough now.
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