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Black or dark gray, extremely dense clouds near the surface are:

ACirrus
BCumulus
CStratus
DNimbus
Answer & Solution
Correct answer: D. Nimbus
1. They are opaque to the sun's rays. 2. They are nimbus clouds. 3. They are shapeless masses of thick vapour. _Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 11, Water in the Atmosphere._
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