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.
Why does magma rise to the Earth's surface? A: Magma rises to the Earth's surface due to a combination of differences in density with other rocks in the crust and pressure. The differences in density ca... Full Answer >