Q79
Which technique is used to map subsurface layers without excavation?
A.
Seismic survey
AnswerB.
Petrographic analysis
C.
Hand augering
D.
X-ray diffraction
Answer: Option A
Solution
Answer: Option A
Solution:
A seismic survey uses the propagation of seismic waves to map subsurface geological structures.It is commonly used in site investigations and oil exploration. Correct Answer: Seismic survey.