Which field of science studies the composition and structure of matter?
chemistry
geology
physics
biology

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.