What causes asphyxiation?

Fine particles can cause dryness of the throat, tickling, coughing and if the concentration ...can also cause asphyxiation by replacing the oxygen in the blood

The formation of numerous, closely spaced rills due to the uneven removal of surface soil by streamlets of running water. Also known as rilling; rill wash; rillwork.

is a cause of the phenomenon (such as a disease or weather)

A headace is cause by a boy named hasan alabaca. he is so dumb and lound.:]

What could be the causes of poor academic carrer of some students carrer of students poor causes