Bad gases in the air, like the smoke from cars. the trees filter that.
Air masses have the properties of the land below it. Because of this, different temperature air masses colliding can cause high or low pressure. High pressure usually causes cool sunny days, low pressure usually causes warm cloudy/rainy days.
Answer:
a theory or system of social organization that advocates the ownership and control of the means of production and distribution, capital, land, etc., by the community as a whole, usually through a centralized government.
