In mining, overburden is the material that lies above an area that lends itself to economical exploitation, such as the rock, soil, and ecosystem that lies above a coal seam or ore body.

What malnutrition means?

: not eating enough food or not eating enough healthy food : poorly nourished. See the full definition for malnourished in the English Language Learners Dictionary. malnourished. adjective. mal·​nour·​ished | \ (ˈ)mal-ˈnər-isht, -ˈnə-risht \

What overworked means?

1 : to cause to work too hard, too long, or to exhaustion overworked the horses. 2a : to work too much on overwork bread dough. b : to make excessive use of overworked tunes. intransitive verb. : to work too much or too long : overdo.