What is the primary cause of acid rain

The map above shows where people live in the united states. areas that are darker blue are areas where people live close together. areas that are lighter colors are places where people live farther apart. as a geographer, if you were to study where people live and why they choose to live in these places, which of the six essential elements of geography would you be using?

What weather system might be occurring if the pressure gradient decreases and fish harvests in peru are weaker than normal

Plzz on what physical process is responsible for the creation of volcanoes, earthquakes and ocean trenches at the plate margins?