Consider the following statements :

1. Rocks do not remain in their original form for long and undergo transformation.

2. Transformation of rocks is caused by weathering, erosion and metamorphic action.

Which of the statements given above is/are correct?

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  1. 1 only
  2. 2 only
  3. Both 1 and 2
  4. Neither 1 nor 2

Answer (Detailed Solution Below)

Option 3 : Both 1 and 2
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Detailed Solution

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The correct answer is Both 1 and 2.

Key Points

  • Rock Cycle
    • Rocks do not remain in their original form for long but may undergo transformation. Hence, Statement 1 is correct.
    • It is a continuous process through which old rocks are transformed into new ones.
    • Igneous rocks are primary rocks and other rocks (sedimentary and metamorphic) form from these primary rocks.
    • Igneous rocks can be changed into metamorphic rocks.
    • The fragments derived from igneous and metamorphic rocks form sedimentary rocks.
    • Sedimentary rocks themselves can turn into fragments and the fragments can be a source for the formation of sedimentary rocks.
    • The crustal rocks (igneous, metamorphic and sedimentary) once formed may be carried down into the mantle (interior of the earth) through the subduction process (parts or whole of crustal plates going down under another plate in zones of plate convergence) and the same meltdown due to increase in temperature in the interior and turn into molten magma, the original source for igneous rocks.
    • The transformation of rocks is caused by weathering, erosion, and metamorphic action. Hence, Statement 2 is correct.

Rock cycle

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