Why is the legend on a map essential

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?

Which event had the greatest impact on culture of south america

Ineed to draw a simple map of oil where can be found on the map.