heavy burden ( synonym found)
Definition of heavy burden:

°The rock and subsoil that lies above a mineral deposit such as a coal seam.
°A sterile stratum that lies above the stratum being investigated.
°To overload or overtax.
Definition of heavy burden:

°The rock and subsoil that lies above a mineral deposit such as a coal seam.
°A sterile stratum that lies above the stratum being investigated.
°To overload or overtax.
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