Choices are acid rain, climate change or ozone depletion

a, b, c — acid rain

e, f — ozone depletion

d — Your instructor probably expects the answer “climate change”. However, infrared radiation has caused air molecules to warm ever since the Earth had an atmosphere and long before what we now call climate change.

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.