The great plain is sometimes called a breadbasket. why is that a appropriate name?

how is this physics related?

The great plains are called the breadbasket because they are the main producers of the US's wheat grain.

If your talking about Ukraine, the same reason applies but the food goes to russia

increases it

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.