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Q: The principal constituent of silicious rock is :
  • A. lime
  • B. clay
  • C. sand
  • D. slate
Correct Answer: Option C - Based on chemical characteristics– The rocks may be classified as argillaceous, silicious and calcareous. Siliceous– The principal constituent silica (SiO₂) i.e. sand the rock are very hard and durable. Ex- Granite, basalt, trap, quartzite, gneiss syenite etc.
C. Based on chemical characteristics– The rocks may be classified as argillaceous, silicious and calcareous. Siliceous– The principal constituent silica (SiO₂) i.e. sand the rock are very hard and durable. Ex- Granite, basalt, trap, quartzite, gneiss syenite etc.

Explanations:

Based on chemical characteristics– The rocks may be classified as argillaceous, silicious and calcareous. Siliceous– The principal constituent silica (SiO₂) i.e. sand the rock are very hard and durable. Ex- Granite, basalt, trap, quartzite, gneiss syenite etc.