Which component of magma includes mobile ions of silicon?

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

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?

The creation of the european union has had all of the following effects except