Discussion
Assertion: geophysical survey should be calibrated against boreholes. Reason: it measures a physical property rather than identifying the material directly.
Answer: D
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason gives the mechanism. Geophysics measures velocity, resistivity or density, none of which identifies a material on its own - the same resistivity may mean a saturated sand or a clay. A borehole at one point on the traverse ties the measured property to the actual ground, and the survey then extends that identification along the line.
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