Passage: 'Satellite radar interferometry measures millimeter-scale ground subsidence caused by excessive groundwater extraction across coastal megacities.' What capability of interferometry is highlighted?
Answer and explanation
Correct answer: C. High-precision measurement of subtle ground deformation from orbit
- Step 1: 'measures millimeter-scale ground subsidence... from orbit'. Step 2. It provides millimeter-precision detection of ground subsidence. Answer: High-precision measurement of subtle ground deformation from orbit. Why not the others: Radar does not purify water, extract steam, or detect gases directly.
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