air pressure is the greatest where
It's the troposphere because : The troposphere contains 75 per cent of the atmosphere's gas. It also holds huge amounts of dust and water vapor, and is often dense with clouds and mist. Air pressure is greatest in the troposphere, because gravity pulls the atmosphere towards the Earth, squeezing most of its weight into this lowest layer. It's the troposphere because : The troposphere contains 75 per cent of the atmosphere's gas.