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Q: Formation of ______ type(s) of rocks involves biological activity in addition to complex mechanical or chemical processes.
  • A. sedimentary
  • B. igneous
  • C. sedimentary and metamorphic
  • D. metamorphic
Correct Answer: Option A - Sedimentary rocks–These rocks are formed by the consolidation of the products of weathering obtained from the pre-existing rocks. It is also known as aqueous or stratified rocks. The various weathering agencies e.g. rain, sun, air, frost etc. break up the surface of earth. Examples–Gravel, sandstone, limestone, gypsum, lignite, sandstone etc. Metamorphic rocks–These rocks are formed by the change in character of pre-existing rocks when subjected to great heat and pressure. Example–Quartzite, Schist state, marble, gneiss etc.
A. Sedimentary rocks–These rocks are formed by the consolidation of the products of weathering obtained from the pre-existing rocks. It is also known as aqueous or stratified rocks. The various weathering agencies e.g. rain, sun, air, frost etc. break up the surface of earth. Examples–Gravel, sandstone, limestone, gypsum, lignite, sandstone etc. Metamorphic rocks–These rocks are formed by the change in character of pre-existing rocks when subjected to great heat and pressure. Example–Quartzite, Schist state, marble, gneiss etc.

Explanations:

Sedimentary rocks–These rocks are formed by the consolidation of the products of weathering obtained from the pre-existing rocks. It is also known as aqueous or stratified rocks. The various weathering agencies e.g. rain, sun, air, frost etc. break up the surface of earth. Examples–Gravel, sandstone, limestone, gypsum, lignite, sandstone etc. Metamorphic rocks–These rocks are formed by the change in character of pre-existing rocks when subjected to great heat and pressure. Example–Quartzite, Schist state, marble, gneiss etc.