What is the longest river in the world? nile or amazon?

The large connected urbane area from boston to washington, d.c. is often referred to as

What happens to rock when acid reacts with it?

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?