Por favor ajuda!???​

In a scientific experiment, a is any factor that can be changed or be changed

Alow pressure system is formed when an air mass cools over a cool surface and sinks. true or false

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?