The Gambia has no migrating wildebeest, giraffes or any of the large animals commonly associated with Africa. However without leaving your hotel you can see a breathtaking variety of bird life, in addition to monkeys and lizards. Baboons and crocodiles can be seen nearby and then far up the river, hippos.
As the gasses collect in the magma chamber, the pressure rises. It is possible for the pressure to rise so much that the chamber cannot contain the magma and it erupts explosively. Some US Parks that have active volcanoes formed as the result of subduction related processes are: 1  Crater Lake National Park, OR.
How do volcanoes form along Converging boundaries. At a subduction zone the denser plate will sink back into the mantle. Some of the rock above the subducting plate melts and forms magma. The magma rises because it is less dense than the rock and if it finds a weak spot to break through a volcano is formed.