black
burnt
business
chemical
chemistry
color
concepts
concrete
damage
danger
dirt
dirty
disaster
disgust
drilling
emergence
environment
environmental
equipment
fossil
fuel
garbage
gasoline
heap
hole
illness
industry
lake
liquid
mining
monochrome
nature
oil
petroleum
pollution
power
protection
slippery
soil
soot
spilling
substance
technology
toxic
tube
unhygienic
well