One of the key reasons for Federation was to achieve a united defence force which could better protect Australia. Around the 1880s, the Australian colonies had become increasingly concerned over the close proximity of foreign powers.
Split and merge into it. Answered by The Community. Making the world better, one answer at a time. Dissolved gases trapped in the magma provides the force that causes magma to erupt to the surface. Magma is molten material before it reaches the surface and is lava.
The beginning of a volcano. A volcano begins as magma, melted rock inside the earth, Magma results from the extreme heat of the earth's interior. The eruption of a volcano. The gas filled magma in the reservoir is under great pressure from the weight of the solid rock around it.This pressure causes the magma to blast or melt a conduit (channel) in a fracture, or weakened part of the rock. The magma moves up through the conduit to the surface.he beginning of a volcano. A volcano begins as magma, melted rock inside the earth, Magma results from the extreme heat of the earth's interior. The eruption of a volcano. The gas filled magma in the reservoir is under great pressure from the weight of the solid rock around it.