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Q: Which of the following is an example of a sedimentary rock?
  • A. Quartzite
  • B. Sandstone
  • C. Marble
  • D. Granite
Correct Answer: Option B - : (i) Igneous rock–These rocks formed when molten material in the earth solidifies. • It is also called as primary or crystalline rock. • Igneous rock is classified as– (a) Plutonic rock - Ex–Granite (b) Hypabyssal rock - Ex–Oderite, diorite (c) Volcanic rock - Ex–Trap, Basalt, Obsidian. (ii) Sedimentary rock–These rocks formed by deposition, consolidation and sedimentation of pre-existing rocks under the effects of the weathering agencies. Ex–Gravel, sandstone, limestone, shale, gypsum, lignite etc. (iii) Metamorphic rock– Due to effect of high temperature, pressure minerals of pre-existing rock get reconstructed. Ex–Marble, slate, gneiss etc.
B. : (i) Igneous rock–These rocks formed when molten material in the earth solidifies. • It is also called as primary or crystalline rock. • Igneous rock is classified as– (a) Plutonic rock - Ex–Granite (b) Hypabyssal rock - Ex–Oderite, diorite (c) Volcanic rock - Ex–Trap, Basalt, Obsidian. (ii) Sedimentary rock–These rocks formed by deposition, consolidation and sedimentation of pre-existing rocks under the effects of the weathering agencies. Ex–Gravel, sandstone, limestone, shale, gypsum, lignite etc. (iii) Metamorphic rock– Due to effect of high temperature, pressure minerals of pre-existing rock get reconstructed. Ex–Marble, slate, gneiss etc.

Explanations:

: (i) Igneous rock–These rocks formed when molten material in the earth solidifies. • It is also called as primary or crystalline rock. • Igneous rock is classified as– (a) Plutonic rock - Ex–Granite (b) Hypabyssal rock - Ex–Oderite, diorite (c) Volcanic rock - Ex–Trap, Basalt, Obsidian. (ii) Sedimentary rock–These rocks formed by deposition, consolidation and sedimentation of pre-existing rocks under the effects of the weathering agencies. Ex–Gravel, sandstone, limestone, shale, gypsum, lignite etc. (iii) Metamorphic rock– Due to effect of high temperature, pressure minerals of pre-existing rock get reconstructed. Ex–Marble, slate, gneiss etc.