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.
Select two reasons why the magma produced may never reach the surface to form volcanoes o the crust is too thick for magma to push through o magma may solidify as it rises â¢ Conduction is the transfer of heat by direct contact . Radiant heat transfer is the radiating outward of heat from a heated surface.