Anything about geophysics: Solid earth geophysics, Seismology, Plate tectonics, Atmosphere physics...
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5. If orthometric height of ZTT43-62A is 1.703, and the spirit leveled elevation at another point B is 15.811. Calculate the actual orthometric height at B given that observed gravity values at the ZTT and B are 978268.54 and 978264.06 mgals respectively