Cold air is dense and warmer air is less dense and so as the cool dense air sinks the warm air rises and takes its place causing a convection current. This is the same with water and other gaseous and liquid substances.
I think it would be c because an archipelago is a group of islands
One positive effect of devolution is that it helps maintain a cohesive state. This means that it helps the state remained unified.
They are what keep the environment more safe. Without funding to these people crime rates would significantly increase and would cause more danger in the environments such as roads not being properly maintained.
