air

cast

chemical

gas

coal

dig

digger

dirty

dump

ecology

energy

environment

environmental

equipment

excavate

excavation

excavations

extract

factory

fumes

geology

global

heavy

machinery

industrial

industry

iron

landscape

metal

mineral

extraction

mining

mover

mud

openpit

opencast

ore

pit

polluting

pollution

quarry

sand

liquid

solid

smog

smokes

process

technology

toxic

warming