This should read "Magma (not manga)causes powerful and explosive volcanic eruptions and it is the molten rock which in the case of volcanoes flows out on the surface as lava or expels pyroclastic fragments.
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1. Tensional stress (or extensional stress), which stretches rock;
2. Compressional stress, which squeezes rock; and
3. Shear stress, which result in slippage and translation.
It is the source of the nation's petroleum deposits.
The answer to your question is 1/3