Discussion
Which difference exists between geopotential and geometric height at 10 kilometres?
Answer: C
The two differ by a few tens of metres at 10 kilometres, with geopotential height smaller at low latitudes where gravity is weaker and larger at high latitudes. The difference is small enough to ignore for most purposes but large enough to matter in precise work. Being aware that a difference exists is more important than remembering its exact magnitude. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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