what gases are the atmosphere mainly made up of?

what percentages of nitrogen, oxygen and argon are there in the atmosphere?

what is released into the atmosphere by human activity?

name an environmental process that can add gases and particulates to our atmosphere

how was the Earths early atmosphere formed and what did it mainly consist of?

how were oceans formed when the Earth cooled?

how did the evolution of photosynthesizing organisms change the atmosphere?

as well as photosynthesis how else was CO2 removed from the atmosphere and what did the CO2 then form?

what have humans added to the atmosphere to change its composition?

what can human released pollutants do to humans? (give an example)

how can human released pollutants affect animals? (give an example)

how are the concentrations of pollutants measured in the air?

why is it important to repeat measurements of pollutant concentration?

what particles are elements made from?

how do molecules form?

does each element has a unique atom?

how do compounds form?

what happens to a reactant to form a product?

what does it mean when someone says that mass is conserved in a chemical reaction?

what is coal mainly made up of?

what fuels are mainly compounds of hydrogen and carbon?

when fuels burn what combines with atoms of oxygen to produce carbon dioxide and/or water?

what happens when a fuel reacts with oxygen?

what is a loss of oxygen an example of and what does this mean?

what is oxidation?

why do fuels burn more rapidly in pure oxygen than in air?

can oxygen be obtained from the atmosphere and what can it be used to support?

why is sulfur dioxide produced is a fuel containing sulfur is burnt?

what compounds are formed when burning fossil fuels?

what are the chemical formulas for
-carbon monoxide
-carbon dioxide
-sulfur dioxide
-nitrogen monoxide
-nitrogen dioxide
-water?

how is nitrogen monoxide formed?

what is nitrogen oxide oxidized into?

where do
-particulate carbon
-sulfur dioxide
-carbon dioxide
go after combustion?

how can we reduce pollution from burning fossil fuels in power stations?

how is the acid gas, sulfur dioxide removed from glue gases?

what is the only way of producing less carbon dioxide?

how can atmospheric pollution caused by exhaust emissions be reduced?

what does a catalytic converter do?

what other things can we use as alternatives to fossil fuels, what are their problems?