Continents have drifted apartbecause of[53rd to 55th BPSC (Pre) 2011](A) Volcanic eruptions(B) Tectonic activities(C) Folding and faulting of rocks(D) All of the above
Question
Continents have drifted apartbecause of53rd to 55th BPSC (Pre) 2011 Volcanic eruptions(B) Tectonic activities(C) Folding and faulting of rocks(D) All of the above
Solution
The continents have drifted apart primarily due to tectonic activities (Option B). This process is known as continental drift and was first proposed by Alfred Wegener. The Earth's lithosphere is broken up into several large and small tectonic plates that float on the semi-fluid layer of the asthenosphere beneath them. These plates move due to the heat in the Earth's core causing convection currents in the mantle.
However, volcanic eruptions (Option A) and folding and faulting of rocks (Option C) are also involved in the process. Volcanic eruptions can cause new crust to form at the boundaries of tectonic plates, pushing them apart. Folding and faulting of rocks can occur as tectonic plates collide, causing land to be pushed upwards to form mountains, or downwards to form valleys and trenches.
Therefore, the correct answer would be (D) All of the above, as all these processes contribute to the drifting of continents.
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