Consider the following statements concerning engineering geology:1. Dams on sedimentary impervious strata dipping upstream will be unsafe.2. In general, igneous rocks are hard and are suitable for construction of large hydraulic structures.3. Construction of a major dam must be preceded by thorough geotechnical investigations.4. Construction of dams is never indicated in any active zone of seismicity.Which of the above statements are correct?

Consider the following statements concerning engineering geology:1. Da

1.	Consider the following statements concerning engineering geology:1. Dams on sedimentary impervious strata dipping upstream will be unsafe.2. In general, igneous rocks are hard and are suitable for construction of large hydraulic structures.3. Construction of a major dam must be preceded by thorough geotechnical investigations.4. Construction of dams is never indicated in any active zone of seismicity.Which of the above statements are correct?
A.	1 and 2 only
B.	1 and 4 only
C.	2 and 3 only
D.	3 and 4 only
Answer» D. 3 and 4 only

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