overburden

nouns

the surface soil that must be moved away to get at coal seams and mineral deposits
overburden
is a type of (narrower)
material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use)
"the land had never been plowed"; "good agricultural soil"
ground, land, soil
an excessive burden
overburden, overload

verbs

burden with too much work or responsibility
overburden
is a type of (narrower)
impose a task upon, assign a responsibility to
"He charged her with cleaning up all the files over the weekend"
burden, charge, saddle
load with excessive weight
overburden
is a type of (narrower)
weight down with a load
burden, burthen, weight, weight down