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Examine the diagram above and answer the following questions - Leaving Cert Geography - Question A - 2013
Question A
Examine the diagram above and answer the following questions. (i) Describe briefly how the currents at A move. (ii) Name the landform at B which is found on the se... show full transcript
Worked Solution & Example Answer:Examine the diagram above and answer the following questions - Leaving Cert Geography - Question A - 2013
Step 1
Describe briefly how the currents at A move.
Answer
The currents at A, which are typically associated with convection currents in the mantle, move in a circular pattern. Hot magma rises towards the surface, cools down, and then sinks back down as it cools, creating a continuous loop. This movement is primarily driven by heat from the Earth's core.
Step 2
Step 3
Step 4
Explain briefly the process of subduction.
Answer
Subduction is the process whereby one tectonic plate moves under another and is forced into the mantle due to plate convergence. This generally occurs at convergent boundaries, leading to the formation of deep ocean trenches and volcanic arcs as the subducted plate melts and interacts with overlying materials.
Step 5
Describe briefly the difference between lava and magma.
Answer
Lava is molten rock that reaches the Earth's surface through volcanic eruptions, while magma is molten rock that is still beneath the surface. The main difference lies in their location; magma is found underground, and once it erupts and flows out, it is referred to as lava.