which principle states that rock fragments in sedimentary layers must be older than the surrounding…

which principle states that rock fragments in sedimentary layers must be older than the surrounding sediments? a) principle of unconformity b) principle of inclusions c) principle of cross - cutting relationships d) principle of superposition question 15 (5 points) what marked the end of the precambrian period? a) the development of dna - based viruses b) the division between archaea and eukarya c) the emergence of simple, protist - like animals d) the appearance of complex, multicellular animals

which principle states that rock fragments in sedimentary layers must be older than the surrounding sediments? a) principle of unconformity b) principle of inclusions c) principle of cross - cutting relationships d) principle of superposition question 15 (5 points) what marked the end of the precambrian period? a) the development of dna - based viruses b) the division between archaea and eukarya c) the emergence of simple, protist - like animals d) the appearance of complex, multicellular animals

Answer

Brief Explanations:

  1. For the first question, the principle of inclusions states that rock - fragments (inclusions) in sedimentary layers must be older than the surrounding sediments. Unconformity is related to gaps in the geological record, cross - cutting relationships deal with the relative age of intrusions and faults, and superposition is about the order of sedimentary layers with the oldest at the bottom.
  2. For the second question, the appearance of complex, multicellular animals marked the end of the Precambrian period. DNA - based viruses, the division between archaea and eukarya, and the emergence of simple, protist - like animals do not mark the end of the Precambrian.

Answer:

  1. B. Principle of inclusions
  2. D. The appearance of complex, multicellular animals