Discussion
Match the following pairs and choose the appropriate option :
| Rocks | Origin/formation |
|---|---|
| (a) Igneous Rocks | (i) Change under great heat and pressure |
| (b) Sedimentary Rocks | (ii) Molten Magma |
| (c) Metamorphic Rocks | (iii) Deposition by wind and water |
Choose the correct option :
Answer: B
The correct matching is (a)-(ii), (b)-(iii), (c)-(i).
Igneous rocks form when molten magma or lava cools and solidifies, as granite and basalt do (ii). Sedimentary rocks form when particles carried by wind, water and ice are deposited in layers and compressed, as sandstone and shale are (iii). Metamorphic rocks form when existing rocks are changed under great heat and pressure, as limestone becomes marble and clay becomes slate (i).
The other options assign at least one of these processes to the wrong rock type; for example option A makes igneous rocks the product of heat and pressure, which is metamorphism.
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